Development of NADPH-diaphorase activity in the central nervous system of the cichlid fish, Tilapia mariae..     ///    "Several trigeminal motor neurons showed strong NADPH-diaphorase activity, whereas the optic tectum and cerebellum were completely free of enzymatic activity. "    ///    "NADPH-diaphorase activity was seen in the neuropil area of the telencephalon, the target of olfactory inputs, and in the sensory dorso-lateral area of the spinal cord.. "