S100A9 and Alzheimer disease: All the proteoforms of S100A9(S) were more abundant in AD patients, and thus Table 1 reports the sum of the XIC peak areas of all the S100A9(S) proteoforms (short and short phosphorylated at Thr108 and their correspondent oxidized derivatives at Met89 or Met78 or Met76 or Met58, Supplementary Table 2).