Melatonin enhances leptin expression by rat adipocytes in the presence of insulin - Alonso-Vale, Maria Isabel Cardoso; Andreotti, Sandra; Peres, Sidney Barnabé; Anhê, Gabriel Forato; Borges-Silva, Cristina das Neves; Cipolla Neto, José; Lima, Fabio Bessa (American Journal of Physiology - Endocrinology and Metabolism, 2005)