Role of steroid hormones and morphine treatment in the modulation of opioid receptor gene expression in brain structures in the female rat - Cruz, Wesley Soares; Pereira, Lucas Assis; Cezar, Luana Carvalho; Camarini, Rosana; Felicio, Luciano Freitas; Bernardi, Maria Martha; Teodorov, Elizabeth (SpringerPlus, 2015)