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Definition of Ligand

Ligand: A molecule that binds to another. Often, a soluble molecule such as a hormone or neurotransmitter that binds to a receptor.

From the Latin ligandus, binding from the root ligare, to bind or tie. Ligate and ligature come from the same root.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=22761
Last Editorial Review: 3/22/2003

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