Epithelial stem cells in disease contexts, with a primary basis on salivary gland stem cells. Disease contexts include the autoimmune disaease primary Sjögren's syndrome (pSS), radaition damage, medication-indcued xerostomia and check point inhibitor-indcued xerostomia. Development of iPS technology for generation of new salivary glands for patients with xerostomia. Cite-Seq analysis of salivary gland biopsies to elucidate potential early events in pSS. In vitro modelling of lymphoepithelial lesions in primary Sjögren's syndrome. Devlopment of senescence markers as surrogates for SG function in pSS. Development of in vitro cell culture models of vasculitis. Functionality of stem cells in other autoimmune idseases, for example Crohns and SLE. Development of mouse model of pSS, based on epithelial cell dysfunction.