Opioid mu-receptors in the rostral medullary raphe modulate hypoxia-induced hyperpnea in unanesthetized rats - Dias, Mirela Barros; Nucci, Tatiane B.; Siqueira Branco, Luiz Guilherme; Gargaglioni, Luciane H. [UNESP] (Federation Amer Soc Exp Biol, 2012)