PPP4R2 (protein phosphatase 4 core regulatory subunit R2) is the regulatory subunit of the histone H2A phosphatase complex. It has been shown to confer resistance to the anticancer drug cisplatin in yeast [1], and may confer resistance in higher eukaryotes.

1: The Saccharomyces cerevisiae orthologue of the human protein phosphatase 4 core regulatory subunit R2 confers resistance to the anticancer drug cisplatin. Hastie CJ, Vazquez-Martin C, Philp A, Stark MJ, Cohen PT; FEBS J. 2006;273:3322-3334. PMID:16857015