SERINE/THREONINE PROTEIN PHOSPHATASE 2A, 65 KDA REGULATORY SUBUNIT A, ALPHA ISOFORM (PP2A, SUBUNIT A, PR65-ALPHA ISOFORM) (PP2A, SUBUNIT A, R1-ALPHA ISOFORM) (MEDIUM TUMOR ANTIGEN-ASSOCIATED 61 KDA PROTEIN). [Source:SWISSPROT;Acc:P30153]