PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2153031-4 1990 First, we measured respective enzymatic activity using a panel of substrates; MPO I was found to have lower activity with some substrates (pyrogallol, guaiacol, potassium iodide [KI]), but similar activity to the other isoenzymes with 4-aminoantipyrine. Guaiacol 151-159 myeloperoxidase Homo sapiens 78-81