Amino acid transporters are proteins that facilitate the movement of amino acids across the plasma membrane of cells. These transporters are essential for the uptake of amino acids from the extracellular fluid, as well as for the release of amino acids from cells into the extracellular fluid. There are different types of amino acid transporters, including symporters, antiporters, and uniporters, that use different mechanisms to move amino acids across the membrane. Dysfunction of amino acid transporters can lead to various diseases, including aminoacidurias, epilepsy, and cancer.