Journal Article Research Support, Non-U.S. Gov't AAb-negative AAb-positive Autoantibodies Autoantibodies (AAb) CXCL13 CXCR5 protein, human Cytotoxic lymphocytes (CTLs); EC 3.1.3.48 Epitopes, T-Lymphocyte FOXP3 protein, human Follicular Treg cells Forkhead Transcription Factors Memory CD8(+) T cells; PD-1 PDCD1 protein, human Programmed Cell Death 1 Receptor Protein Tyrosine Phosphatase, Non-Receptor Type 22 Ptpn22 protein, mouse Ptpn22; Receptors, CXCR5 Regulatory T cells (Treg) Research Support, N.I.H., Extramural Tfh cells Treg cells Type 1 diabetes (T1D) Type 1 diabetes (T1D); Virally-induced T1D;