MUC5B and idiopathic pulmonary fibrosis: Paired snRNA-seq also revealed increased MUC5B expression in epithelial cells clustered from IPF patients; this effect disappeared when secretory cells were removed from the analysis (Figure 5B; average secretory cell MUC5B expression fold change for IPF versus control = 1.91, Padj = 4.9 × 10–41, based on negative binomial regression).