Ig heavy chain class switching is directed by cytokines inducing transcription from unrearranged CH genes .
ig heavy chain class switching is directed by cytokines inducing transcription from unrearranged ch genes .
B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O O O B-protein_family_or_group O O O O B-DNA_family_or_group I-DNA_family_or_group O