the serine protease subcomponents of the activated form of the first component of human complement ( c1 ) , c1r and c1s , were observed by electron microscopy after the native proteins and their limited proteolysis products , obtained from autolytic cleavage ( c1r ) or from incubation with plasmin ( c1s ) were rotary shadowed .
C0036734
serine protease
C0016016
plasmin