The ARPP21 (cAMP regulated phosphoprotein 21) is a protein-coding gene located on chromosome 3.
Isoform 2 of ARPP-21 acts as a competitive inhibitor of calmodulin-dependent enzymes, such as calcineurin, in neurons.
ARPP21 is also known as ARPP-21, R3HDM3, RCS, TARPP.
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