the concentrations of retinyl palmitate ( 8.7 microm ) , retinol ( 4.6 microm ) , all trans-retinoic acid ( 1.3 microm ) and 5,6-epoxyretinoic acid ( 0.25 microm ) measured indicate that acidic retinoids are comparatively significant vitamin a metabolites in kidney .
C0035339
retinoids
C0042839
vitamin a