this was demonstrated by the following observations with the use of sodium dodecyl sulfate-polyacrylamide gel electrophoresis ( sds-page ) of whole platelets and the isolated plasma membrane fraction : ( 1 ) the specific activity of isolated membrane protein was sevenfold that of whole platelet protein , ( 2 ) no proteins of intact platelets were labeled which were not represented in the isolated plasma membrane , ( 3 ) dd125isa-labeled proteins were altered by trypsin treatment of intact , labeled platelets , and ( 4 ) the pattern of labeling produced by reaction of isolated membranes with dd125isa differed from that produced by the labeling of intact platelets .
C0025252
membrane protein
C0033684
proteins