PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18506224-6 2008 The K(m) values of the PPO for caffeic acid, chlorogenic acid, pyrocatechol, 4-methyl catechol and l-DOPA as substrates were 0.077, 0.198, 1.176, 1.667 and 4.545 mM. caffeic acid 31-43 polyphenol oxidase I, chloroplastic Triticum aestivum 23-26