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Definition of Thymosin

Thymosin: One of several polypeptide hormones secreted by the thymus that control the maturation of T cells. They are derived from a polypeptide called prothymosin-alpha (PTMA) or alpha thymosin.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=31618
Last Editorial Review: 3/21/2004

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