network comprised of melanocortin neurons. The role of neural melanocortin-3 receptors
(MC3R) in mediating these responses is enigmatic. Mc3r knockout mice exhibit a
paradoxical phenotype of obesity and reduced feeding-related behaviors in situations of
nutrient scarcity. Here we examined whether MC3Rs expressed in mesolimbic neurons
regulate feeding-related motivational responses. Methods Interactions between Mc3r …