PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 6377248-1 1984 Acute intermittent porphyria is caused by an inherent error of porphyrin metabolism characterized by a deficiency of porphobilinogen deaminase and increased activity of delta-aminolevulinic acid synthase, key enzymes necessary for the biosynthesis of heme. Porphyrins 63-72 hydroxymethylbilane synthase Homo sapiens 117-142