Crept, or Regulation of nuclear pre-mRNA domain containing 1B, is a human gene encoded by RPRD1B. It may also be known as: Regulation of nuclear pre-mRNA domain-containing protein 1B; Cell cycle-related and expression-elevated protein in tumor; cell-cycle related and expression-elevated protein in tumor; C20orf77; CREPT; NET60; dJ1057B20.2. The encoded protein has an amino acid length of 326 and a mass of 36.9 kDa. Crept is a member of the UPF0400 (RTT103) family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.