A high-frequency recombination cell (Hfr cell) (also called an Hfr strain) is a bacterium with a conjugative plasmid (often the F-factor) integrated into its genomic DNA. The Hfr strain was first characterized by Luca Cavalli-Sforza. Unlike a normal F+ cell, Hfr strains will, upon conjugation with a F− cell, attempt to transfer their entire DNA ...
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http://en.wikipedia.org/wiki/Hfr_cell
(from the article `episome`) ...bacteria in which they occur. Episomes may be attached to the bacterial cell membrane (such a cell is designated F+) or become integrated into the ...
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http://www.britannica.com/eb/a-z/h/46
E. coli cell in which an F plasmid has integrated into the host cell’s chromosome
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
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