Biomarker Biomarkers are measures medical professionals can use to evaluate your MS, which they can consistently evaluate over time. They can be super simple (like your pulse) or more complicated (like blood tests). Other Terms Antibody The secret to defending against bacteria and viruses. Ataxia Unsteady on your feet? Learn more about ataxia. Autoimmune Disease When the immune system gets a bit confused... Axon The middle men of the nervous system, often impacted by MS. View More