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substance P

a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
Origin of substance P
earlier standard preparation P (1931); the initial is unexplained by the substance's discoverers Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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substance-p in Medicine

substance P n.
A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.

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