MUC5AC and chronic rhinosinusitis with nasal polyps: Despite higher MUC5AC protein expression in CRSwNP, its mRNA expression was lower in tissue of CRSwNP (Figures 1J,O,S,W) while there was no significant change both in protein and mRNA expression of Forkhead box J1 (Foxj1) (Figures 1P,S,X).