Abstract
The rat hepatoma cell line, H4-II-E, was grown serially over a 1-year period and about 30 passages in arginine-, glutamine-, and tyrosine-deprived and ornithine-supplemented Eagle's minimum essential medium with no supplements other than biotin. The adapted cell line, R-Y121B, proliferates in the above mentioned medium with a doubling time of about 4 days and maintains hepatic "marker" enzymes such as tyrosine aminotransferase, phenylalanine hydroxylase, and all the enzymes of the urea cycle.
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