the neutral sphingomyelinase from brain tissue , localized in cell membranes , has a high mr ( 160 000 and 600 000 ) , is heat labile , hydrolyses sphingomyelin and its coloured and fluorescent analogues , but not 2-n-hexadecanoylamido-nitrophenyl-phosphorylcholine .
C3539580
neutral sphingomyelinase
C0007603
cell membranes