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creating a ligand article
A ligand is a molecule that specifically binds to another molecule, often a larger one. Ligand binding usually causes a receptor protein to undergo a change of shape, which often activates the receptor. After activation, the receptor can then interact with other cellular molecules. <ref>Campbell, Neil A., and Jane B. Reece. Biology. San Francisco: Benjamin Cummings, 2002. Print.</ref>

==References==
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