Chromosomes of normal guinea pig (strain 2) cells and of cell lines derived from a spontaneously arising leukemia were analyzed in detail. All cell lines studied, LG-L2C, GH-L2C, BZ-L*C, and EN-L2C, contained one M1 marker and two X chromosomes, in addition to other chromosome abnormalities specific for each cell line. The presence of the M1 marker and the two X chromosomes confirmed that all of these leukemic cell lines are derived from one ancestral line. Comparison of the chromosome markers and immunologic characteristics of these lines revealed that possibly the gene involved in the determination of C3receptor sites is located on the terminal portion of the long arm of chromosome #2, but no other correlations could be made.
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