The invention relates to Citrobacter phytases derived from Citrobacter amalonaticus, Citrobacter gillenii, and related phytases. The phytases belong to the acid histidine phosphatase family, are acid-stable, and expectedly of a high specific activity. The invention also relates to the corresponding DNA, the recombinant and wild-type production of the phytases, as well as the use thereof, in particular in animal feed.
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