in an effort to identify potential cellular enzymes that might be involved in this process we have found that a human urinary plasminogen activator , urokinase , is capable of specifically cleaving diphtheria toxin to yield an enzymatically active a fragment ( more homogeneous than that produced by trypsin cleavage ) and a b fragment ( with an identical amino-terminal sequence to that produced by trypsin cleavage ) .
C0086418
human
C0042071
urokinase