DARPP32, or Protein phosphatase 1 regulatory inhibitor subunit 1B, is a human gene encoded by PPP1R1B. It may also be known as: Protein phosphatase 1 regulatory subunit 1B; Dopamine- and cAMP-regulated neuronal phosphoprotein; DARPP-32; dopamine and cAMP regulated phosphoprotein; protein phosphatase 1, regulatory (inhibitor) subunit 1B. The encoded protein has an amino acid length of 204 and a mass of 23.0 kDa. Other isoforms may exist. DARPP32 is a member of the Protein phosphatase inhibitor 1 family. Homologs of this gene exist in other organisms, including: Frog.