NCIt definition : Proteinase Inhibitor Genes encode Proteinase Inhibitor Proteins that block the activity
of proteases, endopeptidases that catalyze the cleavage of internal peptide bonds
in a polypeptide or protein substrate (Serine Endopeptidases, Cysteine Endopeptidases,
Aspartic Endopeptidases, Metalloendopeptidases, and other Endopeptidases). (NCI);
Semantic type(s)