Fig. 1.

Mapping the immune cell atlas by single-cell RNA sequencing (scRNA-seq). The advanced technologies in scRNA-seq allows construction of an immune cell atlas at the single-cell level. The immune cell atlas contains the detailed cellular and molecular signatures of immune cells from different physiological as well as pathological contexts, tissues, individuals, and species. scRNA-seq can also be combined with single-cell multi-omic analysis, and spatial gene expression analysis to promote our understanding of the immune system