Abstract
Xanthine dehydrogenase activity has been found in callus cultures of Nicotiana tabacum and in 8 nitrate reductase-deficient mutant lines derived from the former. Another mutant cell line lacks both xanthine dehydrogenase and nitrate reductase activity. This finding supports the hypothesis that in Nicotiana tabacum xanthine dehydrogenase and nitrate reductase share a common molybdenum-containing co-factor.
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