Endocrine aspects of the opioidergic stimulation in pregnant rats - Felicio, Luciano Freitas; Sukikara, Marcia Harumi; Felippe, Érika Cristiane Gutierrez; Anselmo-Franci, Janete Aparecida; Oliveira, Cláudio Alvarenga de (International Behavioral Neuroscience Society, 2007)