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While this strain displays the properties expected of a female or recipient in a number of genetic tests, the FP 2 determined property of mercury resistance is retained by the strain, suggesting that it may carry the FP2 factor in a mutated form. Treatment of the donor strain PAT (FP2 + ) with acridine-mustard has produced mutant male strains with the ability to form recombinants with other male strains at frequencies similar to that obtained in FP2+ \u00d7 FP2 \u2212 matings. This characteristic has been shown to be due to a mutation in the FP2 factor which is dominant to the wild-type function. The isolation of stable male strains carrying both the mutant and wild type forms of the sex factor suggests that more than one copy of the FP 2 factor occurs in<jats:italic>P. aeruginosa<\/jats:italic>strain PAT donors.<\/jats:p>","DOI":"10.1017\/s0016672300014294","type":"journal-article","created":{"date-parts":[[2009,9,17]],"date-time":"2009-09-17T07:52:05Z","timestamp":1253173925000},"page":"91-108","source":"Crossref","is-referenced-by-count":123,"title":["A mutant sex factor of<i>Pseudomonas aeruginosa<\/i>"],"prefix":"10.1155","volume":"19","author":[{"given":"V. A.","family":"Stanisich","sequence":"first","affiliation":[]},{"given":"B. 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