While there was additional positive staining in the peripheral lung, αvβ6 expression is highest in the AT2 epithelial cells in the IPF samples compared to overall low expression level in the normal lung sections (Supplementary Fig. 9b, c), mirroring the expression data of ITGB6 described below (Fig. 3b). Here, ITGB6 is linked to idiopathic pulmonary fibrosis.