Lipocalin‐2 (LCN2), also known as 24p3 or neutrophil gelatinase‐associated lipocalin (NGAL), is a 25‐kDa protein that is acutely produced and secreted from neutrophils, astrocytes, endothelial cells, and microglia in response to infection, inflammation, and injury.17 The gene discussed is LCN2; the disease is infection.