For the SDF-1a and CXCR4 genes, the transcript levels were higher in the mock infected cultures from IPF patients, with ratios of the means 1.56 (p = 0.758) and 2.29 (p = 0.372), respectively compared to the mock infected from healthy donors. The gene discussed is CXCL12; the disease is idiopathic pulmonary fibrosis.