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Kitsuji, Nobuo (Kanazawa University, Kanazawa, Ishikawa, Japan). Thymineless mutation site onEscherichia coli chromosome. J. Bacteriol.87: 802–808. 1964.—Kinetic studies of the recombinant formation in crosses betweenEscherichia coli K-12 Hfr H, Hfr C, or Hfr P10 as donor and F− W1177thy − his − as recipients showed that the time of appearance ofthy + Sm r recombinants lay between that ofxyl + Sm r andhis + Sm r , indicating that thethy gene lies between thexyl andhis markers. Genetic analysis of recombinants of the Hfr C × W117thy − his − cross further indicated that thethy gene is located on the chromosome between theSm marker and thehis marker. In matings between seven independently isolated thymineless mutants of Hfr P10 and F− W1177thy − his − ,thy + recombinants of various recombination rates appeared. Thus, it was suggested that inE. coli K-12 thethy gene occupies some region between theSm marker and thehis marker on the chromosome, and that there are many thymineless mutation sites in it.

THYMINELESS MUTATION SITE ON ESCHERICHIA COLI CHROMOSOME