4 porphobilinogen + H2O = hydroxymethylbilane + 4 NH4(+)
4 porphobilinogen + h2o = hydroxymethylbilane + 4 nh4(+)
"(4-[2-carboxyethyl]-3-[carboxymethyl]pyrrol-2-yl)methyltransferase (hydrolyzing)"
"(4-[2-carboxyethyl]-3-[carboxymethyl]pyrrol-2-yl)methyltransferase (hydrolyzing)"