Sarcoplasmic/endoplasmic reticulum Calcium-ATPase 2 (SERCA2) is a magnesium-dependent pump that catalyzes the hydrolysis of ATP and translocates calcium from the cytosol to the sarcoplasmic reticulum lumen. There are 2 SERCA2 isoforms that differ in the 3' UTR. The SERCA2A isoform is highly expressed in heart and slow twitch skeletal muscle and is important to the regulation of the contraction and relaxation cycle, while the SERCA2B isoform is expressed in smooth muscle and adult epidermis. SERCA2 is also known as ATP2A2, ATP2B, DAR, DD, and MGC45367.