plasma membranes isolated from human neutrophils after brief exposure to phorbol 12-myristate 13-acetate contain a large portion ( 30-40 % ) of the total cellular protein kinase c ( melloni , e. , pontremoli , s. , michetti , m. , sacco , o. , sparatore , b. , salamino , f. , and horecker , b. l. ( 1986 ) biochem . biophys . res . commun . 136 , 228-234 ) and also retain almost 90 % of their content of neutral serine proteinase ( pontremoli , s. , melloni , e. , michetti , m. , sacco , o. , sparatore , b. , salamino , f. , damiani , g. , and horecker , b. l. ( 1986 ) proc . natl . acad . sci . u.s.a. 83 , 1685-1689 ) .
C0007603
plasma membranes
C0007634
cellular