Organization of the orexin/hypocretin system in the brain of two basal actinopterygian fishes, the cladistians Polypterus senegalus and Erpetoichthys calabaricus
Keywords: Orexins; Tyrosine hydroxylase; Serotonin; Immunohistochemistry; Hypothalamus; Polypteridae; Brain evolution; ac; anterior commissure; aCb; cerebellar auricle; cCb; crista cerebellaris; Cb; cerebellum; cc; central canal; Cg; central gray; DF; dorsal funicu