Receptors are proteins, usually cell surface receptors, which bind to ligands and cause responses in the immune system, including cytokine receptors, growth factor receptor and Fc receptor. Receptors can be found in various immune cells like B cells, T cells, NK cells, monocytes and stem cells. A molecule such as a hormone, toxin and parts of the outside of a virus or microbe binding to a receptor is called a ligand. A ligand can activate or inhibit the receptor's associated-biochemical pathway when it binds to its corresponding receptor.
Receptors can induce cell growth, division and death; control membrane channels or regulate cell binding. Receptors play an important role in signal transduction, immunetherapy and immune responses.
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