Citation: Vj. Dirita et al., DIFFERENTIAL EXPRESSION OF THE TOXR REGULON IN CLASSICAL AND EL-TOR BIOTYPES OF VIBRIO-CHOLERAE IS DUE TO BIOTYPE-SPECIFIC CONTROL OVER TOXT EXPRESSION, Proceedings of the National Academy of Sciences of the United Statesof America, 93(15), 1996, pp. 7991-7995