ATB BETA (Arabidopsis thaliana serine/threonine protein phosphatase 2A 55 kDa regulatory subunit B beta isofor); nucleotide binding. Identical to Serine/threonine protein phosphatase 2A 55 kDa regulatory subunit B beta isoform (PP2AB2) [Arabidopsis Thaliana] (GB:Q39247;GB:Q9FZ61); similar to ATB ALPHA (protein phosphatase 2A 55 kDa regulatory subunit B alpha isoform), nucleotide binding [Arabidopsis thaliana] (TAIR:AT1G51690.2); similar to ATB ALPHA (protein phosphatase 2A 55 kDa regulatory subunit B alpha isoform), nucleotide binding [Arabidopsis thaliana] (TAIR:AT1G51690.1); similar to Ser/Thr specific protein phosphatase 2A B regulatory s