IL2 and inflammatory bowel disease: For example, IL2, radiolabelled with both gamma emitters (99mTc, 123I) and positron emitters (18F), has been extensively studied for imaging activated T-lymphocytes in several chronic inflammatory and autoimmune diseases such as inflammatory bowel disease (IBD), Sjögren syndrome (SS), type 1 diabetes, and thyroiditis [10,11,12,13,14].