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Genetic transfer from a donor strain to a recipient strain of bacteria, taking place through a bacteriophage. Zinder and Lederberg (1952) discovered a special mode of genetic exchange through a bacteriophage which carries a chromosomal fragment from the host into another bacterium. This so-called transduction phenomenon has been observed in various microorganisms ( Hist. Gen. Sc. , T. 3, vol. 2 , 1964 , p. 704). In the field of general eukaryotic biology [ the living being whose cells have a structured nucleus ], another major acquisition lies in the discovery of the mechanisms ensuring the propagation of an external signal (hormone, neurotransmitter, growth factor) from the membrane to the limit of the nucleus. The name transduction is often given to these phenomena. It is a capital discovery ( F. Gros , La Civilization du gene , 1989, p. 47).