NRB1 is an alias for the gene, Protein phosphatase 1 regulatory subunit 9A, in humans. Other names include: Neurabin-1; Neural tissue-specific F-actin-binding protein I; Neurabin-I; NRBI; protein phosphatase 1, regulatory subunit 9A. The encoded protein has an amino acid length of 1098 and a mass of 123.3 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.