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   > (GO:0003674) molecular_function [10671, 18 ][dist]
         > (GO:0005215) transporter activity [1110, 348 ][dist]
               > (GO:0015932) nucleobase, nucleoside, nucleotide and nucleic acid transmembrane transporter activity [12, 0][dist]
                     > (GO:0015205) nucleobase transmembrane transporter activity [0,0]
                           > (GO:0005350) pyrimidine transmembrane transporter activity [0,0]
                                 > (GO:0015209) cytosine transmembrane transporter activity [0,0]
                                       -> (GO:0015504) cytosine:hydrogen ion symporter activity [0,0]