Efficient gene activation requires the heterodimerization of VDR with Retinoid X Receptors ( RXR ) .
efficient gene activation requires the heterodimerization of vdr with retinoid x receptors ( rxr ) .
O B-other_name I-other_name O O B-other_name O B-protein_family_or_group O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O O