|  |  | catalytic activityporphobilinogen synthase activityextracellular spacecytosolporphyrin-containing compound biosynthetic processheme biosynthetic processresponse to nutrientmetabolic processzinc ion bindingresponse to organic substanceresponse to metal ionresponse to zinc ionlyase activitylead ion bindingtetrapyrrole biosynthetic processresponse to drugidentical protein bindingresponse to ethanolresponse to arsenic-containing substanceresponse to cadmium ionmetal ion bindingprotein homooligomerizationcellular response to interleukin-4
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