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   > (GO:0003674) molecular_function [10671, 18 ][dist]
         > (GO:0005488) binding [6378, 250 ][dist]
               > (GO:0046906) tetrapyrrole binding [273, 0][dist]
                     -> (GO:0016168) chlorophyll binding [0,0]
                     -> (GO:0020037) heme binding [273, 273 ][dist]