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Center: Confocal 3D projection showing the expression pattern of the vasopressin/oxytocin receptor related receptor ntr-1 in the head of wild-type C. elegans worms. Top right: 3D atom model of the NTR-1 peptide ligand, nematocin, which was identified as the C. elegans vasopressin/oxytocin orthologue. Bottom left: 3D structure model of the NTR-1 GPCR.