1.14.13.39 nitric-oxide synthase (NADPH) claustrum two populations of NADPH diaphorase-positive neurons exist in the human claustrustrum. One is comprised of large and medium cells consistent with a projection neuron phenotype, the other is represented by small cells resembling the interneuron phenotype as defined by previous Golgi impregnation studies. NADPH diaphorase-reactive neurons are heterogenously distributed throughout the claustrum 742604 3.4.21.26 prolyl oligopeptidase claustrum - 694399