an N-acylsphing-4-enine 1-phosphate + choline + H(+) => a sphingomyelin + H2O
an n-acylsphing-4-enine 1-phosphate + choline + h(+) => a sphingomyelin + h2o
an N-acylsphing-4-enine 1-phosphate + choline + H(+) => a sphingomyelin + H2O
an n-acylsphing-4-enine 1-phosphate + choline + h(+) => a sphingomyelin + h2o