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The process of unidirectional (polarized) transfer of genetic information involving direct cellular contact between a donor and recipient cell; the contact is followed by the formation of a cellular bridge that physically connects the cells; some or all of the chromosome(s) of one cell (\'male\') is then transferred into the other cell (\'female\'); unidirectional conjugation occurs between cells of different mating types. Examples of this process are found in prokaryotes. [ISBN:0387520546]
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