The binding of natural or synthetic ligands to nuclear receptors is the triggering event leading to gene transcription activation or repression .
the binding of natural or synthetic ligands to nuclear receptors is the triggering event leading to gene transcription activation or repression .
O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O O O O O B-other_name I-other_name I-other_name O B-other_name O