Myeloblastin
Myeloblastin ( , "leukocyte proteinase 3" , "leukocyte proteinase 4" , "Wegener's granulomatosis autoantigen" , "proteinase PR-3" , "proteinase-3" , "PMNL proteinase" ) is an enzyme . 
<triplet> proteinase-3 <subj> enzyme <obj> subclass of