Overall, staining for the neutrophil-derived products CitH3 and MPO within islets was more readily detected than for neutrophils identified by the Ly6G cell surface marker; the percentage of Ly6G+ islets was 8.5% ± 3.5% and 4.2% ± 4.2% for 10–12 weeks and T1D onset, respectively (Figure 2D). The gene discussed is MPO; the disease is type 1 diabetes mellitus.