Johnson KE. Changes in the cell coat at the onset of gastrulation in Xenopus laevis embryos.
THE JOURNAL OF EXPERIMENTAL ZOOLOGY 1977;
199:137-42. [PMID:
839183 DOI:
10.1002/jez.1401990115]
[Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Four developmental stages of Xenopus laevis embryos were fixed in standard electron microscopic fixatives with 1% lanthanum nitrate added. This treatment reveals a lanthanum staining material (LSM) on the cell surface and in extracellular spaces. Morula and blastula stage cells have a small amount of LSM; in blastulae, 3 +/- 3 SD % of the cell surface is coated with LSM. In early gastrulae, 29 +/- 6 SD % of the cell periphery is covered with LSM. In late gastrulae, 82 +/- 13 SD % of the cell periphery is either coated with LSM or faces a space with LSM in it. There is also an appreciable accumulation of LSM within extracellular spaces during gastrulation.
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