PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 26575342-1 2016 NOx (NOx NO + NO2) regulates O3 and HOx (HOx OH + HO2) concentrations in the upper troposphere. nicotine 1-N-oxide 0-3 heme oxygenase 2 Homo sapiens 54-57 28942315-4 2018 In the early period of transport, high NOx and VOCs emissions caused O3 production due to reactions with the peroxide and hydroxyl radicals, HO2 and OH. nicotine 1-N-oxide 39-42 heme oxygenase 2 Homo sapiens 141-144