Fig. 1.

Single-cell RNA sequencing analysis of the lung dataset. (A) Unsupervised clustering revealed 31 clusters in integrated lung dataset. (B) Cell type annotation was conducted and 12 cell types were identified. (C) Expression of canonical marker genes used for cell type annotation. (D) Expression differences in all 6 reported receptors between COVID-19 patients and healthy controls. Y stands for COVID-19 patients, N stands for healthy controls. (E) Dot plot shows the expression of six receptors in all identified cell types.