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What do a.m. and p.m. stand for?

a chain

a chain in Medicine

A chain n.
A polypeptide component of insulin containing 21 amino acids, the composition of which is species-specific.

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