SERINE/THREONINE PROTEIN PHOSPHATASE 2A, 55 KDA REGULATORY SUBUNIT B, ALPHA ISOFORM (PP2A, SUBUNIT B, B-ALPHA ISOFORM) (PP2A, SUBUNIT B, B55-ALPHA ISOFORM) (PP2A, SUBUNIT B, PR55-ALPHA ISOFORM) (PP2A, SUBUNIT B, R2-ALPHA ISOFORM). [Source:SWISSPROT;Acc:Q00007]