PR61alpha is an alias for the gene, Protein phosphatase 2 regulatory subunit B', alpha, in humans. Other names include: Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit alpha isoform; PP2A B subunit isoform B56-alpha; PP2A B subunit isoform PR61-alpha; PP2A B subunit isoform R5-alpha; PP2A B subunit isoform B'-alpha; B56A; PR61A; protein phosphatase 2, regulatory subunit B', alpha. The encoded protein has an amino acid length of 486 and a mass of 56.2 kDa. Other isoforms may exist. PR61alpha is a member of the Phosphatase 2A regulatory subunit B56 family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.