CXCR3 also serves as a receptor for CXCL9, CXCL10, and CXCL11 (51, 52), but the enhanced interaction between CXCR3 and these chemokines was undetectable in COVID-19 patients, as their protein and mRNA levels were very low or undetectable. The gene discussed is CXCL11; the disease is COVID-19.