MUC5AC and asthma: Other epithelial subtypes showed more disease-specific patterns: Pre-TB secretory cells were associated with asthma (FDR = 0.020) and COVID-19 (FDR = 0.047), Goblet cells with IPF (FDR = 0.047), and Hillock-like epithelial cells specifically with asthma (FDR = 0.035), possibly reflecting epithelial hyperplasia and mucin production in airway remodeling [31,32,33] (Figure 1).