Figure 1.

ACE2 expression in BAL-derived pulmonary immune cells. (A) Flow cytometry panel of BAL-derived cells. The CD11b⁺CD16⁺CD45⁺CD169⁺CD206⁺ cells were AMs, the CD11b⁺CD15^–CD16⁺CD45⁺CD169^– cells were non-AMs macrophages, the CD11b⁺CD15⁺CD16⁺CD45⁺CD169^– cells were neutrophils, and the CD11b^–CD45⁺ cells were lymphocytes. (B) Composition of BAL-derived pulmonary immune cells of non–smoking participants. (C) Comparison of ACE2 expression in different pulmonary immune cells. The columns and error bars represent the means and SEM of experiments. The statistically significant differences between groups are indicated with *, **, and *** (*P < 0.05, **P < 0.01, ***P < 0.005, paired t test).