inactive renin in human plasma can be activated by ph 3.3-dialysis ( generation of acid-activated renin ) , by clotting factor xii-mediated prekallikrein to kallikrein conversion after ph has been restored to neural ( generation of acid-kallikrein-activated renin ) or by the addition of trypsin ( generation of trypsin-activated renin ) .
C0033024
prekallikrein
C0022478
kallikrein