Hypocretin Signaling in Cavefish and Surface Fish (image) Florida Atlantic University Share Print E-Mail Caption Hypocretin, previously implicated in human narcolepsy, is expressed at higher levels in the cavefish brain (A. mexicanus). Image of Mexican cavefish and surface fish counterparts (top). Brains of surface fish (left) and cavefish (right) with wake-promoting Hypocretin protein depicted in green (bottom). Credit Alex Keene, Florida Atlantic University Usage Restrictions Credit: Alex Keene, Florida Atlantic University Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.