the effects of four retinoids , all-trans-retinoic acid ( tretinoin ) , 13-cis-retinoic acid ( isotretinoin ) , r0 10-1670 ( etretin ) and the arotinoid , r0 15-0778 , on fibroblast proliferation and glycosaminoglycans ( gag ) secretion in vitro were studied .
C0035339
retinoids
C0022265
isotretinoin