(3) QKL treatment exerted its therapeutic effects on rats with pneumonia by regulating lung gene (Pla2g2a, Pla2g5, Alox12e, Cyp4a8, Ccl19, and Ccl21) expression associated with arachidonic acid metabolism and inflammation-related pathways (e.g., NF-κB signal pathway). The gene discussed is CCL21; the disease is pneumonia.