In addition to the detection of SNO‐Aco, the chemoselective‐organomercury/MS dataset revealed that the only S‐nitrosylated TCA enzymes that were found exclusively in AD brains and not in Controls were isocitrate dehydrogenase (IDH α‐subunit) and αKGDH subunit 1 (Table S1, Supporting Information, EXCEL spreadsheet 5, labeled “Unique to AD,” highlighted in yellow). The gene discussed is IDH3A; the disease is Alzheimer disease.