There are a number of ELISA Kits available for the measurement of Orexin B, another term for the human protein, hypocretin neuropeptide precursor. Other synonyms may include: orexin, hypocretin (orexin) neuropeptide, prepro-orexin, and NRCLP1. It is encoded by the HCRT gene to yield a protein 131 amino acids in length and 13.4 kDa in size. The protein is categorized into the Orexin family. Versions of Orexin B are present in other organisms, including: Mouse, Rat.