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Usually, receptors are proteins found on or within the membrane. Many different types of molecules can bind to receptors on the cell surface, including hormones. An insulin receptor is an example of a receptor that binds to a hormones, specifically insulin.
Receptor binding surfaces of insulin. Extensive biochemical and structural characterization of the hormone over decades has demonstrated that the surfaces of insulin that bind IR sites 1 and 2 comprise residues predominantly drawn from the insulin dimerization (site 1) and hexamerization (site 2) surfaces.