Definition(s)
- Any nonprotein substance required by a protein for biological activity, such as prosthetic groups of coenzymes, which are not consumed in the process and are found unchanged at the end of the reaction.
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Definition from: CRISP Thesaurus via Unified Medical Language System at the National Library of Medicine
- 1) A substance that acts with another substance to bring about certain effects;
2) Something (as a diet or virus) that acts with or aids another factor in causing disease.
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Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.