PTK2 and gastritis: Analysis of sliced sections of the irradiated stomachs stained with haematoxylin and eosin (HE) showed that the stomachs of Frnk-KO mice were highly deformed (Fig. 6D, E; Supplementary Fig. S7A, B), and demonstrated characteristics of acute gastritis, unlike their WT counterparts (Fig. 6F–I; Supplementary Fig. S7C–F).