Biological target

A biological target is an enzyme, receptor or other protein that can be modified by an external stimulus. The definition is context-dependent and can refer to the biological target of a pharmacologically active drug compound, or the receptor target of a hormone (like insulin). The implication is that a molecule is "hit" by a signal and its behavior is thereby changed.

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This term is commonly used in pharmaceutical research to describe the native protein in the body that is modified by a medicinal chemical.