Intestinal Immunity in Neurologic Disease

Inclusion Criteria:

* Age 18 and up

ONE of the following:

* Recommended to under a screening colonoscopy (+/- upper endoscopy) as part of standard of care. This includes healthy individuals as well as those with neurologic and/or autoimmune diseases. OR
* Willing to undergo research colonoscopy (+/- upper endoscopy) for research

Exclusion Criteria:

* Currently pregnant. Women of childbearing potential would perform a point of care urine pregnancy test prior to colonoscopy/endoscopy.
* Known or suspected, chronic inflammatory gastrointestinal disease (e.g. inflammatory bowel disease)
* Known, acute or chronic infections
* Systemic antibiotic (PO or IV) use within 3 months of colonoscopy
* Systemic corticosteroid use (equivalent of prednisone 10 mg per day or higher for \>5 days) within 2 weeks of colonoscopy
* Malignancy, diagnosed or treated within the last 5 years
* Probiotic use within 2 weeks of procedure
* History of major GI surgery (e.g. colon resection, gastric bypass)
* Bleeding disorder, or on anticoagulant medication
* Other medical condition that, in the judgement of the investigator, would lead to higher-than-expected risks of biopsy
* Allergy to MAC anesthesia or other drugs used pursuant to standard of care for biospecimen collection