Ryanodine receptor 2 (RyR2) is a type of intracellular calcium release channel found primarily in cardiac muscle cells. It is part of the ryanodine receptor family, which also includes other isoforms such as RyR1 (predominantly found in skeletal muscle) and RyR3 (found in various tissues). RyR2 plays a crucial role in the regulation of calcium ions (Ca²⁺) in the heart, which is essential for muscle contraction and relaxation.
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