our observations ( i ) support those which suggest that rana bm resembles mammaliam bm as a source of antibody-producing cells , ( ii ) indicate that specific immune responses in bm may result in a 20-fold increase in the frequency of antigen-related plasma cells among total mnc 's , and ( iii ) suggest that bm b cell clonal expansion , maturation and secretion may result in an increase in specific antibody levels in serum .
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bm
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bm