This protein also binds to the immunoglobulin heavy-chain enhancer mu E1 site .
this protein also binds to the immunoglobulin heavy-chain enhancer mu e1 site .
O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O