Cell Surface Marker Expression in Autoimmune Diseases

Inclusion Criteria: 1. Male or female participants 19 years of age or older. 2. Participant or legal surrogate able and willing to provide written, informed consent. 3. Participant is, or has been undergoing care for one of the specified diseases in a participating centre with a confirmed clinical diagnosis of the specified disease. 4. Participant has or will provide the relevant peripheral blood (required) and normal practice tissue specimens (if available). 5. Participant has one of the following target auto-immune or inflammatory diseases diagnosed according to local clinical practice guidelines: 1. Crohn's Disease 2. Inflammatory myositis 3. Multiple sclerosis 4. Sjogren's syndrome 5. Systemic lupus erythematosus 6. Systemic sclerosis 7. Ulcerative colitis Exclusion Criteria: 1. Participants receiving investigational therapy within 30 days or 5 half-lives, whichever is longer, prior to enrolment. 2. Participants suffering from any additional disease that may interfere with the biomarker signals as per the investigator's discretion.