1.1.1.102	3-dehydrosphinganine reductase	ceramide biosynthesis	ceramide biosynthesis	-	
1.14.19.17	sphingolipid 4-desaturase	ceramide biosynthesis	ceramide biosynthesis	-	
2.3.1.24	sphingosine N-acyltransferase	ceramide biosynthesis	ceramide biosynthesis	-	
2.3.1.50	serine C-palmitoyltransferase	ceramide biosynthesis	ceramide biosynthesis	-	
6.2.1.3	long-chain-fatty-acid-CoA ligase	ceramide biosynthesis	ceramide biosynthesis	-