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   > (GO:0003674) molecular_function [10671, 18 ][dist]
         > (GO:0003824) catalytic activity [4605, 555 ][dist]
               > (GO:0016787) hydrolase activity [2036, 274 ][dist]
                     > (GO:0016810) hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds [83, 6 ][dist]
                           > (GO:0016814) hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds, in cyclic amidines [10, 0][dist]
                                 > (GO:0019238) cyclohydrolase activity [3, 0][dist]
                                       -> (GO:0003933) GTP cyclohydrolase activity [1, 0][dist]
                                       -> (GO:0003937) IMP cyclohydrolase activity [2, 2 ][dist]
                                       -> (GO:0004477) methenyltetrahydrofolate cyclohydrolase activity [0,0]
                                       -> (GO:0004635) phosphoribosyl-AMP cyclohydrolase activity [0,0]
                                       -> (GO:0018759) methenyltetrahydromethanopterin cyclohydrolase activity [0,0]