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   > (GO:0003674) molecular_function [10671, 18 ][dist]
         > (GO:0003824) catalytic activity [4605, 555 ][dist]
               > (GO:0016491) oxidoreductase activity [724, 377 ][dist]
                     > (GO:0016675) oxidoreductase activity, acting on heme group of donors [9, 0][dist]
                           > (GO:0016677) oxidoreductase activity, acting on heme group of donors, nitrogenous group as acceptor [0,0]
                                 -> (GO:0050140) nitrate reductase (cytochrome) activity [0,0]