PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 32119868-6 2020 We show that the polyamine putrescine can promote pigmentation in human skin explants and primary melanocytes (NHEM) through induction of Tyrosinase which is rate limiting for the synthesis of melanin. Melanins 193-200 tyrosinase Homo sapiens 138-148