The antibody has a proven strong fluorescent staining at a 1/400 - 1/800 dilution and a proven strong biotin-streptavidin/HRP staining at a 1/2000 - 1/4000 dilution in rat hypothalamus. Staining is completely eliminated by pretreatment of the diluted antibody with 10 µg/mL of arginine vasopressin. Pre-adsorption with as much as 100 µg/mL of oxytocin had no effect on immunolabeling.