In vitro RNA synthesis from wild type and mutant gal DNA templates in the absence (−) and presence (+) of CCC. (see Fig. 2 legend for nomenclature). (a) −12 to −14, (b) −15 to −17, (c) −18 to −20, (d) −21 to −22 and (e) −23 to −25 represent P1, while (a) −7 to −9, (b) −10 to −12, (c) −13 to −15, (d) −17 to −18 and (e) −19 to −20 represent P2.