p130 , predominantly in Form 1 , and hypophosphorylated pRb bind an E2F DNA binding site ; p130 complexes E2F-4 , whereas pRb binds both E2F-4 and E2F-1 .
p130 , predominantly in form 1 , and hypophosphorylated prb bind an e2f dna binding site ; p130 complexes e2f-4 , whereas prb binds both e2f-4 and e2f-1 .
B-protein_molecule O O O O O O O B-protein_molecule B-protein_molecule O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-protein_molecule O B-protein_molecule O O B-protein_molecule O O O O B-protein_molecule O