1 in atrial preparations of the young guinea-pig ( body weight 150-250 g ) , five proteolytic enzymes ( trypsin , chymotrypsin , bacterial-al-proteinase ( nagarse ) , bromelain and kallikrein ) produced concentration-dependent positive inotropic and chronotropic effects , while they exerted only minimal effects on the papillary muscle preparations .
C0030940
proteolytic enzymes
C0030946
proteinase