GPI and rheumatoid arthritis: The observed early Treg expansion and elevation of IL-10 levels in cervical lymph nodes and spleen of hαSyn PD and EV mice, 3 days after CD28SA delivery, was in agreement with reports from CD28SA treatment in healthy mice and in models for neuroinflammatory diseases such as glucose-6-phosphate isomerase (G6PI)-induced arthritis as model for rheumatoid arthritis and experimental autoimmune encephalomyelitis (EAE), a model for multiple sclerosis [34, 43, 44].