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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.
Interestingly, growth hormone must bind to two receptor molecules simultaneously to mediate its function. The hormone binds on the outside of the cell, bringing two receptors together. PDB entry 3hhr , shown here, includes the extracellular portion of two receptors bound to growth hormone.