PPP2R2A also known as PP2A B Subunit belongs to the phosphatase 2 regulatory subunit B family. Protein phosphatase 2 is one of the four major Ser/Thr phosphatases, and it is implicated in the negative control of cell growth and division. It consists of a common heteromeric core enzyme, which is composed of a catalytic subunit and a constant regulatory subunit, that associates with a variety of regulatory subunits. The B regulatory subunit might modulate substrate selectivity and catalytic activity. PPP2R2A is an alpha isoform of the regulatory subunit B55 subfamily. Alternatively spliced transcript variants have been described.