polyadenylated rna from the cells was fractionated electrophoretically by size and fixed to diazobenzyloxymethyl-paper , and then immunoglobulin rna species were revealed by hybridization with 32p-labeled cloned sequences for mu heavy chain and kappa light chain . kappa mrna was detected only in b lymphoid lines known to synthesize kappa chains .
C0021027
immunoglobulin
C0021036
kappa