To differentiate whether the RA effect was mediated by RA receptors alpha , beta , and gamma , the expression of the retinoic acid receptors ( RAR ) was examined by reverse transcriptase -polymerase chain reaction ( RT-PCR ) .
to differentiate whether the ra effect was mediated by ra receptors alpha , beta , and gamma , the expression of the retinoic acid receptors ( rar ) was examined by reverse transcriptase -polymerase chain reaction ( rt-pcr ) .
O O O O B-other_organic_compound O O O O O O O O O O O O O O O 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 O O B-protein_molecule I-protein_molecule O O O O B-other_name O O