Notes: Nitrotyrosine (Item No. 89540) is formed by peroxynitrite-mediated nitration of protein tyrosine residues. Its presence on proteins can be used as a marker for peroxynitrite formation in vivo.{5439,1269,4663,5357} Nitrotyrosine EIA Antiserum contains polyclonal (rabbit) IgG that detects nitrotyrosine. It is used in ELISAs designed to quantify nitrotyrosine.