Up-regulated chemokines and receptors, mainly linked to inflammatory activities (CCL5, CCL7, CCL8, CCL11, CCL13, CCL18, CCL19, CCL21, CCL22, CCL24, CXCL6, CXCL10, CXCL12, CXCL13, CXCL14, CXCL17, CCR5, CCR6, CCR7, and CCR8), that contribute to leukocyte recruitment and chronic inflammation in IPF (Figure 2 and Figure 3A,B). This evidence concerns the gene CCL21 and idiopathic pulmonary fibrosis.