PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 10666591-1 2000 The porphobilinogen synthase (PBGS) family of enzymes catalyzes the first common step in the biosynthesis of the essential tetrapyrroles such as chlorophyll and porphyrin. Tetrapyrroles 123-136 aminolevulinate dehydratase Homo sapiens 4-28 10666591-1 2000 The porphobilinogen synthase (PBGS) family of enzymes catalyzes the first common step in the biosynthesis of the essential tetrapyrroles such as chlorophyll and porphyrin. Tetrapyrroles 123-136 aminolevulinate dehydratase Homo sapiens 30-34