Toll-Like Receptor 6 differential expression in two pig genetic groups vaccinated against <it>Mycoplasma hyopneumoniae</it> by Régia Silva Sousa Katiene, Mauric Frossard Ribeiro André, Roberto Nunes Goes Paulo, Eliza Facioni Guimarães Simone, Lopes Paulo Sávio, Veroneze Renata, Gasparino Eliane