Basal, endogenous leptin is metabolically active in newborn rat pups.
Abdennebi-Najar L, Desai M, Han G, Casillas E, Jean D, Arieh G, Ross MG. Basal, endogenous leptin is metabolically active in newborn rat pups. J Matern Fetal Neonatal Med. 2011 Dec; 24(12):1486-91.