Structure, diversity, and mobility of the Salmonella pathogenicity island 7 family of integrative and conjugative elements within Enterobacteriaceae. by Seth-Smith, H, Fookes, M, Okoro, C, Baker, S, Harris, SR, Scott, P, Pickard, D, Quail, M, Churcher, C, Sanders, M, Harmse, J, Dougan, G, Parkhill, J, Thomson, N