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Mouttou A, Lemarchand F, Koc C, Moreau A, Lumeau J, Favard C, Lereu AL. Resonant dielectric multilayer with controlled absorption for enhanced total internal reflection fluorescence microscopy. OPTICS EXPRESS 2022; 30:15365-15375. [PMID: 35473257 DOI: 10.1016/j.omx.2022.100223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Total internal reflection fluorescence microscopy (TIRF-M) is widely used in biological imaging. Evanescent waves, generated at the glass-sample interface, theoretically strongly improve the axial resolution down to a hundred of nanometers. However, objective based TIRF-M suffers from different limitations such as interference fringes and uneven illumination, mixing both propagating and evanescent waves, which degrade the image quality. In principle, uneven illumination could be avoided by increasing the excitation angle, but this results in a drastic loss of excitation power. We designed dedicated 1D photonic crystals in order to circumvent this power loss by directly acting on the intensity of the evanescent field at controlled incident angles. In this framework, we used dedicated resonant multi-dielectric stacks, supporting Bloch surface waves and resulting in large field enhancement when illuminated under the conditions of total internal reflection. Here, we present a numerical optimization of such resonant stacks by adapting the resulting resonance to the angular illumination conditions in TIRF-M and to the fluorescence collection constraints. We thus propose a dedicated resonant structure with a control of the absorption during thin film deposition. A first experimental demonstration illustrates the concept with a 3-fold fluorescence enhancement in agreement with the numerical predictions.
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2
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Mouttou A, Lemarchand F, Koc C, Moreau A, Lumeau J, Favard C, Lereu AL. Resonant dielectric multilayer with controlled absorption for enhanced total internal reflection fluorescence microscopy. OPTICS EXPRESS 2022; 30:15365-15375. [PMID: 35473257 DOI: 10.1364/oe.457353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
Total internal reflection fluorescence microscopy (TIRF-M) is widely used in biological imaging. Evanescent waves, generated at the glass-sample interface, theoretically strongly improve the axial resolution down to a hundred of nanometers. However, objective based TIRF-M suffers from different limitations such as interference fringes and uneven illumination, mixing both propagating and evanescent waves, which degrade the image quality. In principle, uneven illumination could be avoided by increasing the excitation angle, but this results in a drastic loss of excitation power. We designed dedicated 1D photonic crystals in order to circumvent this power loss by directly acting on the intensity of the evanescent field at controlled incident angles. In this framework, we used dedicated resonant multi-dielectric stacks, supporting Bloch surface waves and resulting in large field enhancement when illuminated under the conditions of total internal reflection. Here, we present a numerical optimization of such resonant stacks by adapting the resulting resonance to the angular illumination conditions in TIRF-M and to the fluorescence collection constraints. We thus propose a dedicated resonant structure with a control of the absorption during thin film deposition. A first experimental demonstration illustrates the concept with a 3-fold fluorescence enhancement in agreement with the numerical predictions.
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Cai C, Sun H, Hu L, Fan Z. Visualization of integrin molecules by fluorescence imaging and techniques. ACTA ACUST UNITED AC 2021; 45:229-257. [PMID: 34219865 PMCID: PMC8249084 DOI: 10.32604/biocell.2021.014338] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Integrin molecules are transmembrane αβ heterodimers involved in cell adhesion, trafficking, and signaling. Upon activation, integrins undergo dynamic conformational changes that regulate their affinity to ligands. The physiological functions and activation mechanisms of integrins have been heavily discussed in previous studies and reviews, but the fluorescence imaging techniques -which are powerful tools for biological studies- have not. Here we review the fluorescence labeling methods, imaging techniques, as well as Förster resonance energy transfer assays used to study integrin expression, localization, activation, and functions.
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Affiliation(s)
- Chen Cai
- Department of Immunology, School of Medicine, UConn Health, Farmington, 06030, USA
| | - Hao Sun
- Department of Medicine, University of California, San Diego, La Jolla, 92093, USA
| | - Liang Hu
- Cardiovascular Institute of Zhengzhou University, Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450051, China
| | - Zhichao Fan
- Department of Immunology, School of Medicine, UConn Health, Farmington, 06030, USA
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Ge Y, Gao J, Jordan R, Naumann CA. Changes in Cholesterol Level Alter Integrin Sequestration in Raft-Mimicking Lipid Mixtures. Biophys J 2019; 114:158-167. [PMID: 29320683 DOI: 10.1016/j.bpj.2017.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 11/06/2017] [Indexed: 11/30/2022] Open
Abstract
The influence of cholesterol (CHOL) level on integrin sequestration in raft-mimicking lipid mixtures forming coexisting liquid-ordered (lo) and liquid-disordered (ld) lipid domains is investigated using complementary, single-molecule-sensitive, confocal detection methods. Systematic analysis of membrane protein distribution in such a model membrane environment demonstrates that variation of CHOL level has a profound influence on lo-ld sequestration of integrins, thereby exhibiting overall ld preference in the absence of ligands and lo affinity upon vitronectin addition. Accompanying photon-counting histogram analysis of integrins in the different model membrane mixtures shows that the observed changes of integrin sequestration in response to variations of membrane CHOL level are not associated with altering integrin oligomerization states. Instead, our experiments suggest that the strong CHOL dependence of integrin sequestration can be attributed to CHOL-mediated changes of lipid packing and bilayer thickness in coexisting lo and ld domains, highlighting the significance of a biophysical mechanism of CHOL-mediated regulation of integrin sequestration. We envision that this model membrane study may help clarify the influence of CHOL in integrin functionality in plasma membranes, thus providing further insight into the role of lipid heterogeneities in membrane protein distribution and function in a cellular membrane environment.
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Affiliation(s)
- Yifan Ge
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana
| | - Jiayun Gao
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana
| | - Rainer Jordan
- Makromolekulare Chemie, TU Dresden, Dresden, Germany
| | - Christoph A Naumann
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana; Integrated Nanosystems Development Institute, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana.
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Huet-Calderwood C, Rivera-Molina F, Iwamoto DV, Kromann EB, Toomre D, Calderwood DA. Novel ecto-tagged integrins reveal their trafficking in live cells. Nat Commun 2017; 8:570. [PMID: 28924207 PMCID: PMC5603536 DOI: 10.1038/s41467-017-00646-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 07/16/2017] [Indexed: 12/22/2022] Open
Abstract
Integrins are abundant heterodimeric cell-surface adhesion receptors essential in multicellular organisms. Integrin function is dynamically modulated by endo-exocytic trafficking, however, major mysteries remain about where, when, and how this occurs in living cells. To address this, here we report the generation of functional recombinant β1 integrins with traceable tags inserted in an extracellular loop. We demonstrate that these ‘ecto-tagged’ integrins are cell-surface expressed, localize to adhesions, exhibit normal integrin activation, and restore adhesion in β1 integrin knockout fibroblasts. Importantly, β1 integrins containing an extracellular pH-sensitive pHluorin tag allow direct visualization of integrin exocytosis in live cells and revealed targeted delivery of integrin vesicles to focal adhesions. Further, using β1 integrins containing a HaloTag in combination with membrane-permeant and -impermeant Halo dyes allows imaging of integrin endocytosis and recycling. Thus, ecto-tagged integrins provide novel powerful tools to characterize integrin function and trafficking. Integrins are cell-surface adhesion receptors that are modulated by endo-exocytic trafficking, but existing tools to study this process can interfere with function. Here the authors develop β1 integrins carrying traceable tags in the extracellular domain; a pH-sensitive pHlourin tag or a HaloTag to facilitate dye attachment.
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Affiliation(s)
- Clotilde Huet-Calderwood
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA
| | - Felix Rivera-Molina
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA
| | - Daniel V Iwamoto
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA
| | - Emil B Kromann
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA.,Department of Biomedical Engineering, Yale University, 333 Cedar Street, New Haven, Connecticut, 06520, USA
| | - Derek Toomre
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA.
| | - David A Calderwood
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA. .,Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut, 06520, USA.
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Hyoun Kim M, Kim SG, Guhn Kim C, Kim DW. A novel Tc-99m and fluorescence labeled peptide as a multimodal imaging agent for targeting angiogenesis in a murine hindlimb ischemia model. Appl Radiat Isot 2016; 121:22-27. [PMID: 28013153 DOI: 10.1016/j.apradiso.2016.12.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 12/09/2016] [Accepted: 12/18/2016] [Indexed: 12/25/2022]
Abstract
The serine-aspartic acid-valine (SDV) peptide binds specifically to integrin αvβ3. We developed a Tc-99m and TAMRA labeled peptide, Tc-99m SDV-ECG-K-TAMRA for multimodal imaging of angiogenesis. Tc-99m SDV-ECG-K-TAMRA was prepared in high yield (>96%) and showed low cytotoxicity. Tc-99m tetrofosmin images 1 week after operation, revealed significantly decreased perfusion of the ischemic hindlimb, and the perfusion recovered gradually for 4 weeks. In contrast, Tc-99m SDV-ECG-K-TAMRA uptake was maximal 1 week after the operation (ischemic-to-non-ischemic uptake ratio =5.03±1.01) and decreased gradually. The ischemic-to-non-ischemic ratio of Tc-99m SDV-ECG-K-TAMRA and Tc-99m tetrofosmin was strongly negatively correlated (r =-0.94). A postmortem analysis revealed increased angiogenesis markers and uptake of Tc-99m SDV-ECG-K-TAMRA by ischemic tissue. Our in vivo and in vitro studies revealed substantial uptake of Tc-99m SDV-ECG-K-TAMRA by ischemic tissue. Tc-99m SDV-ECG-K-TAMRA could be a good candidate dual-modality imaging agent to assess angiogenesis.
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Affiliation(s)
- Myoung Hyoun Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Seul-Gi Kim
- Research Unit of Molecular Imaging Agent (RUMIA), Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Chang Guhn Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Dae-Weung Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea; Research Unit of Molecular Imaging Agent (RUMIA), Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea.
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Kim DW, Kim MH, Kim CG. Tc‑99m Ser‑Asp‑Val‑Glu‑Cys‑Gly: A novel Tc‑99m labeled hexapeptide for molecular and non‑invasive tumor imaging. Mol Med Rep 2016; 14:4887-4892. [PMID: 27748918 DOI: 10.3892/mmr.2016.5811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 09/26/2016] [Indexed: 11/06/2022] Open
Abstract
In a ProteoChip‑based screening system and subsequent studies, serine‑aspartic acid‑valine (SDV) was demonstrated to specifically bind to integrin αvβ3. An SDV‑containing peptide could target the tumor vessel and it may be an effective replacement for molecular imaging of the tumor. In the present study, a hexapeptide, SDV‑glutamic acid‑cysteine‑glycine (ECG), was developed and evaluated its diagnostic performance as a tumor imaging agent in tumor‑bearing mice. The hexapeptide SDV‑ECG was synthesized using Fmoc solid‑phase peptide synthesis. Following radiolabeling procedures with technetium‑99m, the Tc‑99m SDV‑ECG complexes were prepared at high yields (>97%). The uptake of Tc‑99m SDV‑ECG within HT‑1080 tumor cells (integrin αvβ3‑positive) was confirmed by in vitro studies. γ‑camera imaging revealed substantial uptake of Tc‑99m SDV‑ECG in the HT‑1080 cell line tumor murine model. With the co‑injection of excess SDV, tumoral uptake was blocked. Furthermore, HT‑29 tumor cells (integrin αvβ3‑negative) and inflammatory lesions demonstrated minimal uptake of Tc‑99m SDV‑ECG. In the present study, Tc‑99m SDV‑ECG was developed as a novel Tc‑99m agent for tumor imaging. The current in vitro and in vivo studies demonstrated specific functions of Tc‑99m SDV‑ECG in tumor imaging.
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Affiliation(s)
- Dae-Weung Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk‑do 570‑711, Republic of Korea
| | - Myoung Hyoun Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk‑do 570‑711, Republic of Korea
| | - Chang Guhn Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk‑do 570‑711, Republic of Korea
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Kim MH, Kim CG, Kim SG, Kim DW. A novel Tc-99 m and fluorescence labeled peptide as a multimodal imaging agent for targeting angiogenesis in a murine tumor model. CONTRAST MEDIA & MOLECULAR IMAGING 2016; 11:527-534. [PMID: 27739174 DOI: 10.1002/cmmi.1714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/17/2016] [Accepted: 08/19/2016] [Indexed: 11/06/2022]
Abstract
The serine-aspartic acid-valine (SDV) peptide binds specifically to integrin αV β3 . In the present study, we successfully developed a TAMRA-GHEG-ECG-SDV peptide labeled with both Tc-99 m and TAMRA to target the integrin αV β3 of tumor cells; furthermore, we evaluated the diagnostic performance of Tc-99 m TAMRA-GHEG-ECG-SDV as a dual-modality imaging agent for tumor of the murine model. TAMRA-GHEG-ECG-SDV was synthesized using Fmoc solid-phase peptide synthesis. Radiolabeling of TAMRA-GHEG-ECG-SDV with Tc-99 m was done using ligand exchange methods. Labeling stability and cytotoxicity studies were performed. Gamma camera imaging, biodistribution and ex vivo imaging studies were performed in murine models with HT-1080 and HT-29 tumors. A tumor tissue slide was prepared and analyzed using confocal microscopy. After radiolabeling procedures with Tc-99 m, the Tc-99 m TAMRA-GHEG-ECG-SDV complexes were prepared in high yield (>99%). In the gamma camera imaging study, a substantial uptake of Tc-99 m TAMRA-GHEG-ECG-SDV into HT-1080 tumor (integrin αV β3 positive) and low uptake of Tc-99 m TAMRA-GHEG-ECG-SDV into HT-29 tumor (integrin αV β3 negative) were demonstrated. A competition study revealed that HT-1080 tumor uptake was effectively blocked by the co-injection of an excess concentration of SDV. Specific uptake of Tc-99 m TAMRA-GHEG-ECG-SDV was confirmed by biodistribution, ex vivo imaging and confocal microscopy studies. Our in vivo and in vitro studies revealed substantial uptake of Tc-99 m TAMRA-GHEG-ECG-SDV in the integrin αV β3 -positive tumor. Tc-99 m TAMRA-GHEG-ECG-SDV could be a good candidate for a dual-modality imaging agent targeting tumor angiogenesis. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Myoung Hyoun Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Chang Guhn Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Seul-Gi Kim
- Research Unit of Molecular Imaging Agent (RUMIA), Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Dae-Weung Kim
- Department of Nuclear Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea.,Research Unit of Molecular Imaging Agent (RUMIA), Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
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Evaluation of a Flexible NOTA-RGD Kit Solution Using Gallium-68 from Different 68Ge/68Ga-Generators: Pharmacokinetics and Biodistribution in Nonhuman Primates and Demonstration of Solitary Pulmonary Nodule Imaging in Humans. Mol Imaging Biol 2016; 19:469-482. [DOI: 10.1007/s11307-016-1014-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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10
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Hong H, Chen F, Zhang Y, Cai W. New radiotracers for imaging of vascular targets in angiogenesis-related diseases. Adv Drug Deliv Rev 2014; 76:2-20. [PMID: 25086372 DOI: 10.1016/j.addr.2014.07.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Revised: 07/14/2014] [Accepted: 07/22/2014] [Indexed: 01/03/2023]
Abstract
Tremendous advances over the last several decades in positron emission tomography (PET) and single photon emission computed tomography (SPECT) allow for targeted imaging of molecular and cellular events in the living systems. Angiogenesis, a multistep process regulated by the network of different angiogenic factors, has attracted world-wide interests, due to its pivotal role in the formation and progression of different diseases including cancer, cardiovascular diseases (CVD), and inflammation. In this review article, we will summarize the recent progress in PET or SPECT imaging of a wide variety of vascular targets in three major angiogenesis-related diseases: cancer, cardiovascular diseases, and inflammation. Faster drug development and patient stratification for a specific therapy will become possible with the facilitation of PET or SPECT imaging and it will be critical for the maximum benefit of patients.
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Khotskaya YB, Beck BH, Hurst DR, Han Z, Xia W, Hung MC, Welch DR. Expression of metastasis suppressor BRMS1 in breast cancer cells results in a marked delay in cellular adhesion to matrix. Mol Carcinog 2013; 53:1011-26. [PMID: 24000122 DOI: 10.1002/mc.22068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 05/22/2013] [Accepted: 06/17/2013] [Indexed: 12/29/2022]
Abstract
Metastatic dissemination is a multi-step process that depends on cancer cells' ability to respond to microenvironmental cues by adapting adhesion abilities and undergoing cytoskeletal rearrangement. Breast Cancer Metastasis Suppressor 1 (BRMS1) affects several steps of the metastatic cascade: it decreases survival in circulation, increases susceptibility to anoikis, and reduces capacity to colonize secondary organs. In this report, BRMS1 expression is shown to not significantly alter expression levels of integrin monomers, while time-lapse and confocal microscopy revealed that BRMS1-expressing cells exhibited reduced activation of both β1 integrin and focal adhesion kinase, and decreased localization of these molecules to sites of focal adhesions. Short-term plating of BRMS1-expressing cells onto collagen or fibronectin markedly decreased cytoskeletal reorganization and formation of cellular adhesion projections. Under 3D culture conditions, BRMS1-expressing cells remained rounded and failed to reorganize their cytoskeleton and form invasive colonies. Taken together, BRMS1-expressing breast cancer cells are greatly attenuated in their ability to respond to microenvironment changes. © 2013 Wiley Periodicals, Inc.
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Affiliation(s)
- Yekaterina B Khotskaya
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
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