The function of PPP2R2A (protein phosphatase 2 regulatory subunit Balpha, Ensembl gene identifier ENSG00000221914) is as follows. Substrate-recognition subunit of protein phosphatase 2A (PP2A) that plays a key role in cell cycle by controlling mitosis entry and exit (PubMed:1849734, PubMed:33108758). Involved in chromosome clustering during late mitosis by mediating dephosphorylation of MKI67 (By similarity). Essential for serine/threonine-protein phosphatase 2A- mediated dephosphorylation of WEE1, preventing its ubiquitin-mediated proteolysis, increasing WEE1 protein levels, and promoting the G2/M checkpoint (PubMed:33108758). {ECO:0000250|UniProtKB:Q6P1F6, ECO:0000269|PubMed:1849734, ECO:0000269|PubMed:33108758}.