SERINE/THREONINE PROTEIN PHOSPHATASE 2A, 55 KDA REGULATORY SUBUNIT B, BETA ISOFORM (PP2A, SUBUNIT B, B-BETA ISOFORM) (PP2A, SUBUNIT B, B55- BETA ISOFORM) (PP2A, SUBUNIT B, PR55-BETA ISOFORM) (PP2A, SUBUNIT B, R2-BETA ISOFORM). [Source:SWISSPROT;Acc:Q00005]