tokens: Ig heavy chain class switching is directed by cytokines inducing transcription from unrearranged CH genes .
folded_tokens: ig heavy chain class switching is directed by cytokines inducing transcription from unrearranged ch genes .
labels: 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