P74, or Spermatid perinuclear RNA binding protein, is a human gene encoded by STRBP. It may also be known as: Spermatid perinuclear RNA-binding protein; HEL162; ILF3L; SPNR. The encoded protein has an amino acid length of 672 and a mass of 73.7 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.