The MAPK/ERK pathway is a chain of proteins in the cell that communicates a signal from a receptor on the surface of the cell to the DNA in the nucleus of the cell. The signal starts when a signaling molecule binds to the receptor on the cell surface and ends when the DNA in the nucleus expresses a protein and produces some change in the cell, such as cell division. The pathway includes many proteins, including MAPK, which communicate by adding phosphate groups to a neighboring protein, which ac
accessory noun (EXTRA) C1 [ C usually plural ] something added to a machine or to clothing that has a useful or decorative purpose: She wore a green wool suit with matching accessories (= shoes, hat, bag, etc.). Sunglasses are much more than a fashion accessory.
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