patient serum cultured with muscle cells showed that ( a ) the patient 's serum exhibited a trophic effect on human muscle cells in culture , ( b ) this trophic effect increased the differentiation and did not influence the proliferation of human muscle cells , and ( c ) the fraction of the patient 's serum immunoadsorbed on antihuman kappa chain antibodies exhibited the same in vitro effect on the muscle cells , whereas the fraction immunoadsorbed on antihuman lambda chain antibodies did not .
C0007589
differentiation
C0007634
the