Population 1 (CD16+CD10+CD63hiCD62L–PD-L1–) was predominantly enriched in 1 healthy donor and virtually absent in others, whereas population 6 (CD16+CD10+CD62L+CXCR2+CXCR4–) (Figure 1, F and G), which contained CD16+CD10+ cells, was underrepresented in COVID-19. The gene discussed is CXCR4; the disease is COVID-19.