the gel patterns of membranes isolated from lysosomes after treatment with ( 1 ) [ 125i ] iodidehydrogen peroxide-lactoperoxidase , ( 2 ) toluene 2,4-di-isocyanate-activated bovine serum albumin , ( 3 ) trypsin and ( 4 ) subtilisin indicate that most of the membrane proteins are exposed to the cytoplasm .
C0024369
lysosomes
C0010834
cytoplasm