3.1.4.41 extracellular - - 3.1.4.41 membrane associated to 16020 3.1.4.41 membrane associated, SMase-C activity is detected in soluble and particulate fractions 16020 3.1.4.41 plasma membrane - 5886 3.1.4.41 plasma membrane in the outer leaflet of the plasma membrane 5886 3.1.4.41 soluble SMase-C activity is detected in soluble and particulate fractions -