PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15206795-6 2003 We observed that both enzymes converted this substrate to melanin and that peroxidase, in the presence of hydrogen peroxide, was much more effective than tyrosinase in catalysing the oxidative polymerization of 5-hydroxytryptophan, with the formation of insoluble black melanin-like pigments. 5-Hydroxytryptophan 211-230 tyrosinase Homo sapiens 154-164