Expression of ACSL5 mRNA in ATII was higher than other epithelial types of healthy, ATI of idiopathic pulmonary fibrosis (IPF), basal epithelia of IPF and ADC, ciliated epithelia of COPD, ADC and para‐cancer tissues, club epithelia of IPF, ADC and systemic sclerosis‐associated interstitial lung disease (SSC), Goblet epithelia of ADC and mucous epithelial of IPF and ADC (Figure 3F), as compared with those in corresponding epithelia of healthy. The gene discussed is ACSL5; the disease is chronic obstructive pulmonary disease.