BACKGROUND : Retinoic acid ( RA ) has important immune-modulating effects on both T and B cell function .
background : retinoic acid ( ra ) has important immune-modulating effects on both t and b cell function .
O O B-other_organic_compound I-other_organic_compound O B-other_organic_compound O O O B-other_name I-other_name O O O O O O O O