Ohio State University May 2 2025 After spending years tracing the origin and migration pattern of an unusual type of immune cell in mice, researchers have shown in a new study how activity of "good" microbes in the gut is linked to rheumatoid arthritis and, potentially, other autoimmune diseases. Scientists first reported in 2016 that specific gut microbes known as commensal bacteria, which cause no harm and often contribute to host health, set off production and release of a gut-originated T