1.2.1.3	aldehyde dehydrogenase (NAD+)	sphingosine and sphingosine-1-phosphate metabolism	
1.3.1.8	acyl-CoA dehydrogenase (NADP+)	sphingosine and sphingosine-1-phosphate metabolism	
1.3.1.27	2-hexadecenal reductase	sphingosine and sphingosine-1-phosphate metabolism	
2.7.1.91	sphingosine kinase	sphingosine and sphingosine-1-phosphate metabolism	
3.5.1.23	ceramidase	sphingosine and sphingosine-1-phosphate metabolism	
6.2.1.3	long-chain-fatty-acid-CoA ligase	sphingosine and sphingosine-1-phosphate metabolism