PabpI, or Poly(A) binding protein, cytoplasmic 1, is a human gene encoded by PABPC1. It may also be known as: Polyadenylate-binding protein 1; PABP-1; Poly(A)-binding protein 1; PABP; PABPC2. The encoded protein has an amino acid length of 636 and a mass of 70.7 kDa. Other isoforms may exist. PabpI is a member of the Polyadenylate-binding protein type-1 family. Homologs of this gene exist in other organisms, including: Yeast, Fly, Mouse, Rat, Frog.