PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23263862-1 2013 Frameshift mutations in the last coding exon of the 5-aminolevulinate synthase (ALAS) 2 gene were described to activate the enzyme causing increased levels of zinc- and metal-free protoporphyrin in patients with X-linked dominant protoporphyria (XLDPP). Metals 169-174 5'-aminolevulinate synthase 2 Homo sapiens 80-87