Regulatory subunit of calcineurin, a calcium-dependent, calmodulin stimulated protein phosphatase. Confers calcium sensitivity.
Subcellular locations: Cytoplasm, Cytosol, Cell membrane, Cell membrane, Sarcolemma, Cell membrane
Translocates from the cytosol to the sarcolemma in a CIB1-dependent manner during cardiomyocyte hypertrophy.