from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A substance that affects the growth of a cell or an organism.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A naturally-occurring substance capable of
stimulating cellular growth, proliferation, and cellular differentiation.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a protein that is involved in cell differentiation and growth
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