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Chromosome mapping in Pseudomonas aeruginosa PAT.

ABSTRACT

A linkage map of Pseudomonas aeruginosa PAT has been derived from the results of conjugation experiments using the plasmids FP2-2, R68, R91-5, and R68.45. FP2-2 and R68 each mobilize the chromosome from single, distinct transfer origins. R91-5 appears to mobilize the chromosome from two such origins, and R68.45 utilizes a number of transfer origins. R68 and R91-5 have both been shown to mobilize the chromosome with a polarity opposite to that by FP2-2. The locations of the transfer origins of these plasmids are such that it has not been possible to demonstrate chromosomal circularity by means of interrupted mating experiments. However, the available time-of-entry data combined with linkage data from plate mating experiments support the conclusion that the chromosome of P. aeruginosa is circular.

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