The biological effects of RA are mediated by two distinct families of transcription factors : retinoic acid receptors ( RARs ) and retinoid X receptors ( RXRs ) .
the biological effects of ra are mediated by two distinct families of transcription factors : retinoic acid receptors ( rars ) and retinoid x receptors ( rxrs ) .
O B-other_name I-other_name O B-other_organic_compound O O O O O O O B-protein_family_or_group I-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 B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O O