MUC5AC and gallstones: A thin layer of mucin gel in the gallbladder appears to be important for reducing the susceptibility to CGD in LD‐fed gallstone‐resistant AKR/J mice.[12] Periodic acid‐Schiff (PAS) staining showed that the deposition of mucin was significantly higher in the gallbladder epithelium of WD‐fed miceC70‐KO and LD‐fed miceWT as compared to WD‐fed miceWT (Figure 6A).