NCIt definition : Any substance that inhibits a protease, an enzyme that breaks peptide bonds. Proteases
are required for many cell processes and inhibition of proteases can inhibit viral
replication, inflammatory responses, proliferation, and tumor growth.;
Alternative definition : NCI-GLOSS: A compound that interferes with the ability of certain enzymes to break
down proteins. Some protease inhibitors can keep a virus from making copies of itself
(for example, AIDS virus protease inhibitors), and some can prevent cancer cells from
spreading.;