Meningococcal genetic variation mechanisms viewed through comparative analysis of serogroup C strain FAM18. by Bentley, S, Vernikos, G, Snyder, L, Churcher, C, Arrowsmith, C, Chillingworth, T, Cronin, A, Davis, P, Holroyd, N, Jagels, K, Maddison, M, Moule, S, Rabbinowitsch, E, Sharp, S, Unwin, L, Whitehead, S, Quail, M, Achtman, M, Barrell, B, Saunders, N, Parkhill, J