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Virulence patterns of the 60 enterococci isolates from mastitic dairy cows in Gansu province and Ningxia Hui autonomous region. Esp, enterococcus surface protein; gelE, gelatinase; ccf, sex pheromone; CylA, cytolysin activator component A; asa1, aggregation substance; ace, collagen binding protein; agg, aggregation protein.
