RSAD2 and chronic obstructive pulmonary disease: FP also suppressed RV induction of 2′–5′-OAS, PKR and viperin (Fig. 5d–f) and additionally suppressed IFN-β, IFN-λ1/3 and CXCL10/IP-10 proteins in supernatants of COPD AECs (Fig. 5g–i).