PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 21080654-13 2010 These kinetics and the 20-fold increase in the efficiency of tyrosine nitration in the presence of CO2 suggest a specific role for the carbonate radical anion ( CO3(-)) in MnSOD nitration by PN. carbonate radical 135-152 superoxide dismutase 2 Homo sapiens 172-177