Abstract
A revertant clone with restored capacity for metabolic cooperation has been isolated from the cooperation-defective variant embryonal carcinoma cell line R5/3. The properties of the revertant clone provide evidence that deficiencies shown by R5/3 in intercellular transfer of nucleotides and sodium ions are the result of a common genetic lesion which can be dissociated from a secondary lesion causing increased thioguanine resistance and from an increase in ploidy.
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