Combinations of all-trans retinoic acid ( RA ) and VD , in some cases , increased this effect .
combinations of all-trans retinoic acid ( ra ) and vd , in some cases , increased this effect .
O O B-other_organic_compound I-other_organic_compound I-other_organic_compound O B-other_organic_compound O O B-lipid O O O O O O O O O