Actomyosin is a smooth muscle protein found throughout the body. In the intestinal barrier's epithelial cells, actomyosin proteins form cables called the Actin Network. This cable network crosses the inside of epithelial cells and connects to tight junction proteins on either side of the epithelial cells. At appropriate times this cable network of actomyosin contracts to open tight junctions so that small amino acid nutrients can get into the blood stream. To safeguard the body, the cable network expands to keep the tight junctions closed.
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