co-factor

Medical Dictionary

cofactor co·fac·tor (kō'fāk'tər)
n.
A substance, such as a metallic iron or coenzyme, that must be associated with an enzyme for the substance to function.

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