CXCL1 and infection: They are both eQTL for a gene cluster located at 4q13.3 (eFigure 1), encoding several members of the CXC chemokine family such as CXCL8 (aka IL-8), CXCL6, CXCL5, CXCL1, and more, which promote the recruitment of neutrophils to the site of infection.