2.2. Mucositis induction
Vit D was administered intraperitoneally (25 mcg / kg per mouse). MTX was administered intraperitoneally (120 mg/kg Day -1, 60 mg/kg Day 0). IL-22 plasmid was administered through hydrodynamic injection at the tail vein in 2 ml saline (15 mcg/ml) on day -2.