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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.
So, when we talked about steroid hormones, we talked about how they're going to bind to receptors on the nucleus. Non-steroid hormones are going to bind to receptors in the target cell's plasma membrane. Because again, they're not able to pass through the plasma membrane.