orexins [ HCRT protein, human,Hcrt2 protein,hypocretin,hypocretin (orexin) neuropeptide precursor protein, human,hypocretin 1, human,hypocretin 2,hypocretin-1,hypocretin-2,orexin,orexin A,orexin B,orexin-A,orexin-B,prepro-hypocretin,prepro-orexin,preproorexin ] from hypothalamus; orexin-A and orexin-B are derived from the same precursor; a regulator of appetite and wakefulness; do not confuse "HCRT" (= "hypocretin") and "HCRTR" (= "hypocretin receptor") whe