Immunohistochemical determination of estrogen receptor-'alfa' in vaginal and tumor tissues of healthy and TVT-affected bitches and their relation to serum concentrations of estradiol-17'beta' and progesterone - Brito, Claudia Prado de; Oliveira, Clair Motos de; Soares, Fernando Augusto; Faustino, Marcelo; Oliveira, Cláudio Alvarenga de (Theriogenology, 2006)