we show here that it is a membrane-associated , disulphide-linked dimer , it has trypsin-like properties but is not a general protease , in density gradient centrifugation it sediments with perforin , it is secreted by tc cells during their cytolytic attack on target cells , and antiserum to tc-cell serine esterase reacts with the enzyme in th/c cells .
C0030946
protease
C0014442
enzyme