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The strains were characterized as colanic acid producing on the basis of phage m-59 sensitivity and we tentatively conclude that these mutants are Lon<jats:sup>\u2212<\/jats:sup>.<\/jats:p><jats:p>In another series of experiments drug treatment of<jats:italic>E. coli<\/jats:italic>failed to yield significant numbers of auxotrophs and the back mutation rate of a number of<jats:italic>S. typhimurium<\/jats:italic>His<jats:sup>\u2212<\/jats:sup>strains was not significantly increased.<\/jats:p>","DOI":"10.1017\/s0016672300017420","type":"journal-article","created":{"date-parts":[[2009,9,17]],"date-time":"2009-09-17T07:45:15Z","timestamp":1253173515000},"page":"13-20","source":"Crossref","is-referenced-by-count":9,"title":["Selection of<i>lon<\/i>mutants in<i>Escherichia coli<\/i>by treatment with phenothiazines"],"prefix":"10.1155","volume":"30","author":[{"given":"J.","family":"Moln\u00e1r","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"I. 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