In enzymology, a serine C-palmitoyltransferase is an enzyme that catalyzes the chemical reaction: palmitoyl-CoA + L-serine ⇌ {\displaystyle \rightleftharpoons } CoA + 3-dehydro-D-sphinganine + CO2Thus, the two substrates of this enzyme are palmitoyl-CoA and L-serine, whereas its 3 products are CoA, 3-dehydro-D-sphinganine, and CO2. Wikipedia