A rheumatological disorder with features suggestive of several kinds of connective tissue disease, but not definitively diagnostic of any single syndrome. Overlap syndromes typically have elements of systemic lupus erythematosus, rheumatoid arthritis, and progressive systemic sclerosis, among other illnesses.
![DNA graphic](https://www.lupusresearch.org/wp-content/themes/lupusresearch/assets/images/oct-interior.jpg)
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