phosphocholine + an N-acylsphing-4-enine + H(+) => a sphingomyelin + H2O
phosphocholine + an n-acylsphing-4-enine + h(+) => a sphingomyelin + h2o
phosphocholine + an N-acylsphing-4-enine + H(+) => a sphingomyelin + H2O
phosphocholine + an n-acylsphing-4-enine + h(+) => a sphingomyelin + h2o