@article{article63ad6df1, title = {Role of steroid hormones and morphine treatment in the modulation of opioid receptor gene expression in brain structures in the female rat}, author = {Cruz, Wesley Soares and Pereira, Lucas Assis and Cezar, Luana Carvalho and Camarini, Rosana and FelĂ­cio, Luciano Freitas and Bernardi, Maria Martha and Teodorov, Elizabeth}, year = {2015}, doi = {10.1186/s40064-015-1021-8}, journal = {SpringerPlus} }