Email Post: A Direct In Vivo Comparison of The Melanocortin Monovalent Agonist Ac-His-DPhe-Arg-Trp-NH(2) versus The Bivalent Agonist Ac-His-DPhe-Arg-Trp-PEDG20-His-DPhe-Arg-Trp-NH(2): A Bivalent Advantage