Nucleophosmin 1 is an alias for the gene, Nucleophosmin (nucleolar phosphoprotein B23, numatrin), in humans. Other names include: Nucleophosmin; NPM; Nucleolar phosphoprotein B23; Nucleolar protein NO38; Numatrin; nucleophosmin/nucleoplasmin family, member 1; B23. The encoded protein has an amino acid length of 294 and a mass of 32.6 kDa. Nucleophosmin 1 is a member of the Nucleoplasmin family. This gene shares homology with other species, including: Mouse, Frog.