In enzymology, an all-trans-retinol 13,14-reductase is an enzyme, encoded by the RETSAT gene, that catalyzes the chemical reaction all-trans-13,14-dihydroretinol + acceptor ⇌ {\displaystyle \rightleftharpoons } all-trans-retinol + reduced acceptorThus, the two substrates of this enzyme are all-trans-13,14-dihydroretinol and acceptor, whereas its two products are all-trans-retinol and reduced acceptor. Wikipedia