passages.id: split_6_test_1863_passage
passages.type: progene_text
passages.text: T cell reactivities to proinsulin and islet cell Ag p69 exceeded those to GAD67 , and T cell reactivity to proinsulin in the spleen and pancreatic lymph nodes was directed mainly against a p24 - 33 epitope that spans the B chain / C peptide junction .