CNB, or Protein phosphatase 3 regulatory subunit B, alpha, is a human gene encoded by PPP3R1. It may also be known as: Calcineurin subunit B type 1; Protein phosphatase 3 regulatory subunit B alpha isoform 1; Protein phosphatase 2B regulatory subunit 1; calcineurin B, type I (19kDa); protein phosphatase 2B regulatory subunit B alpha; CALNB11; protein phosphatase 3, regulatory subunit B, alpha. The encoded protein has an amino acid length of 170 and a mass of 19.3 kDa. CNB is a member of the Calcineurin regulatory subunit family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog.