Melatonin improves insulin sensitivity independently of weight loss in old obese rats - Zanuto, Ricardo; Siqueira-Filho, Mário Alves de; Caperuto, Luciana C.; Bacurau, Reury Frank Pereira; Hirata, Emiko; Peliciari-Garcia, Rodrigo Antonio; Amaral, Fernanda Gaspar do; Marçal, Anderson Carlos; Ribeiro, Luciene M.; Camporez, João Paulo Gabriel; Carpinelli, Angelo Rafael; Bordin, Silvana; et al. (Journal of Pineal Research, 2013)