NR3B3, or Estrogen-related receptor gamma, is a human gene encoded by ESRRG. It may also be known as: ERR gamma-2; Estrogen receptor-related protein 3; Nuclear receptor subfamily 3 group B member 3; ERR3; ERRgamma. The encoded protein has an amino acid length of 458 and a mass of 51.3 kDa. Other isoforms may exist. NR3B3 is a member of the Nuclear hormone receptor family, NR3 subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.