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Effect on Exclusion of Alterations to the Sex Pilus

^a Department of Microbiology, Lister Institute of Preventive Medicine, Chelsea Bridge Road, London SW1W 8RH, England

ABSTRACT

Chromosomal genes from an Hfr donor, dependent for their transfer upon the integrated F factor, were not excluded by an F⁺ recipient when the donor also carried an F-like R factor, and its sex pili contained, in addition to F pilin, another pilin of a different specificity.

¹ Present address: Biological Laboratories, University of Kent at Canterbury, England.

² Present address: The Royal Institute of Public Health and Hygiene, 28 Portland Place, London W1, England.