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During bacterial conjugation, plasmid DNA is transferred from cell to cell. In Agrobacterium fabrum, conjugation is regulated by the phytochrome photoreceptors Agp1 and Agp2. Both contribute equally to this regulation. Agp1 and Agp2 are histidine kinases, but, for Agp2, we found no autophosphorylation activity. A clear autophosphorylation signal, however, was obtained with mutants in which the phosphoaccepting...
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