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R. K. Bhadra, S. Roychoudhury, R. K. Banerjee, S. Kar, R. Majumdar, S. Sengupta, S. Chatterjee, G. Khetawat, J. Das. "Cholera toxin (CTX) genetic element in Vibrio cholerae O139." Microbiology (1995) 1977-1983