a fatty acyl-CoA + sphing-4-enine = an N-acylsphing-4-enine + CoA + H(+)
a fatty acyl-coa + sphing-4-enine = an n-acylsphing-4-enine + coa + h(+)
"sphingosine N-acyltransferase"
"sphingosine n-acyltransferase"