all-trans-3,4-didehydro-13,14-dihydroretinol + A = all-trans-3,4-didehydroretinol + AH2
all-trans-3,4-didehydro-13,14-dihydroretinol + a = all-trans-3,4-didehydroretinol + ah2
all-trans-3,4-didehydro-13,14-dihydroretinol + A = all-trans-3,4-didehydroretinol + AH2
all-trans-3,4-didehydro-13,14-dihydroretinol + a = all-trans-3,4-didehydroretinol + ah2