After the 1st and 2nd vaccine doses, the proportion of FasL+ Tc lymphocytes was lowered in the IPF group when compared to control group (4.02% vs 7.99; p=0.006 after the 1st dose; 4.21% vs 12.98%; p=0.02 after the 2nd dose) (Heat map 4., Supplementary Table 10; PCA 10-12; Supplementary Data). Here, FASLG is linked to idiopathic pulmonary fibrosis.