here we show that a transfected hla-dr alpha class ii major histocompatibility complex gene , like the endogenous hla-dr alpha genes , is efficiently transcribed in raji cells but not in rm2 or rm3 cells , demonstrating that the mutant cells are deficient in a specific trans-acting factor required for transcription of these genes .
C0019763
hla-dr alpha
C1415575
hla-dr alpha genes