Adaptation to Tissue Culture of the Murine Leukemia ASL1, a High Producer of TL (Thymus Leukemia) Antigen1

Abstract
ASL1, a. murine thymus derived leukemia, was adapted to tissue culture and its suitability as a source of TL antigens was examined. Tissue culture medium was developed in which the cell grew with a mean doubling time of 12.5 h and 95% viability. The quantity of antigen expressed by the cells was determined by inhibition of lysis of 51Cr labelled leukemic cells mediated by anti-TL 1,2,3 serum. Significant quantities of the antigens were retained by the cells during exponential growth in vitro.