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Moderate levels of urease activity (ca. 300 mU mg–1) were detected in Rhizobium leguminosarum bv. viciae UPM791 vegetative cells. This activity did not require urea for induction and was partially repressed by the addition of ammonium into the medium. Lower levels of urease activity (ca. 100 mU mg–1) were detected also in pea bacteroids. A DNA region of ca. 9 kb containing the urease structural genes...
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