Amino acid metabolism in mammalian cell cultures

Tumors induced in hamsters by simian virus 40: persistent subviral infection

The cells of two hamster ependymomas, originally induced by intracerebral inoculation with simian virus 40 in newborn animals, have been serially cultured in vitro. None of the virus was detected in cell-free culture fluids or cell lysates. All cells retained their neoplastic potential when newborn hamsters were inoculated. Data suggest that viral nucleic acid is permanently present in some tumor cells.

Established eurythermic line of fish cells in vitro

An established line of fish cells has been propagated in vitro for 21 months and 48 subcultivations. Important characteristics of the cells are described.

Maintenance of Normal in situ Chromosomal Features in Long-Term Tissue Cultures

Clonal isolates from a rapidly proliferating fibroblast-like derivative have retained the classic diploid chromosome relationship over a period of many transplant generations. The readily identified members of the 11 pairs of chromosomes, including the sex chromosomes (X(1) and X(2)), have aided in localizing minute structural alterations within recloned diploid and aneuploid sublines.