Analyses Illuminate the Pace and Mechanism of Oxytocin Release in the Brain A densely branched network of fine, luminous structures permeates this image. Two color systems are discernible: green and red signaling pathways that partially overlap and bundle together. These are neuronal circuits in the mouse brain through which two important neurotransmitters are distributed: Green denotes oxytocin pathways, red vasopressin networks. Signaling pathways of the bonding hormone oxy