Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of various enzymes, including the endopeptidases and exopeptidases, that catalyze the hydrolytic breakdown of proteins into peptides or amino acids.
from The Century Dictionary.
- noun A generic term for proteolytic ferments.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry  An enzyme thatcuts orcleaves proteins .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								Both drugs are known as protease inhibitors, which are designed to block an enzyme that helps the hepatitis C virus replicate. Hepatitis C Drugs Await FDA Approval Jennifer Corbett Dooren 2011 
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								Both Incivek and Victrelis are known as protease inhibitors, designed to block an enzyme that helps the hepatitis C virus replicate. Hepatitis C Drug Approved Thomas Gryta 2011 
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								Kidney beans also contain protease inhibitors which frustrate the development of cancerous cells. 
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								Kidney beans also contain protease inhibitors which frustrate the development of cancerous cells. Happy Birthday!!! 2006 
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								Kidney beans also contain protease inhibitors which frustrate the development of cancerous cells. Archive 2006-09-01 2006 
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								Prezista, which has been on the market since 2006, is a so-called protease inhibitor designed to treat HIV infection and is taken with the drug Norvir, in combination with other antiretroviral agents. Gilead, J&J Agree to Develop New Combination HIV Drug Peter Loftus 2011 
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								Prezista, which has been on the market since 2006, is a so-called protease inhibitor designed to treat HIV infection and is taken with the drug Norvir, in combination with other antiretroviral agents. Gilead, J&J Agree to Develop New Combination HIV Drug Peter Loftus 2011 
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								The FDA is expected to decide soon on telaprevir, another so-called protease inhibitor from Vertex Pharmaceuticals Inc. and Johnson & Johnson . FDA Clears Merck Hepatitis Drug Jonathan D. Rockoff 2011 
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								Both the Merck and Vertex drugs are known as protease inhibitors, which are designed to block an enzyme that helps hepatitis C virus replicate. Corporate Watch 2010 
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								Both the Merck and Vertex drugs are known as protease inhibitors, which are designed to block an enzyme that helps hepatitis C virus replicate. Merck Reports Encouraging Results for Hepatitis C Treatment 2010 
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