growth-factor

growth factor

noun
any of various proteins that promote the growth, organization, and maintenance of cells and tissues.
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Collins
World English Dictionary
growth factor
 
n
any of several substances present in serum that induce growth of cells. Excessive amounts of growth factor may be associated with the production of cancer cells

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

growth factor n.
A substance that affects the growth of an organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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