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In vitro activity assay of purified NADH-Nitrate Reductase (NR) from Arabidopsis thaliana in cell-free extracts with 0.08, 0.16, 0.4, 0.8, and 1.6 mM NO3 - and 0, 1, 10, or 50 µM omeprazole (OP). Data are means ± s.d. (shown by vertical bars when larger than the symbol); n = 3 from independent experiments. Lines were fitted by linear regression.
