MPO and coronary atherosclerosis: The average neutrophil MPO content in healthy donors (149.3±3.4 MFI) was stable: it did not substantially change with age (age range 20–80 years) or gender (Table S1). The MPO content in contrast was dramatically reduced in patients with ACS (Table 4, Figure 1 and Figure S1), but it was unaffected, either before or after PCI, in patients with CSA who had a greater burden of coronary atherosclerosis than ACS patients (Table 1 and Table 4).