We also found some Il-17a-eGFP-expressing CD4-negative cells in both lamina propria and Peyer’s patches (see upper-left quadrant in Figure 2e and g); however, these cells could not form a clearly distinguishable population in both the antibiotics-treated and non-treated AD mice, which made it difficult to reliably quantify cells. The gene discussed is CD4; the disease is Alzheimer disease.