- Sphingomyelinase from Bacillus cereus,buffered aqueous glycerol solution, ≥100 units/mg protein (Lowry), 25U
- Lyophilized powder stabilized with appro,25% bovine serum albumin, ≥200 units/mg protein (enzyme + BSA), 50U
- Lyophilized powder stabilized with appro,25% bovine serum albumin, ≥200 units/mg protein (enzyme + BSA), 10U