Assertion: osteoarthritis rheumatoid arthritis | /r/HasProperty | ra
Facets:
Source sentences:
text: About rheumatoid arthritis Rheumatoid arthritis (RA) occurs when the body’s immune system mistakenly attacks healthy tissue.
text: About rheumatoid arthritis Rheumatoid arthritis (RA) is an autoimmune disease that causes your body to mistakenly attack the membranes that line your joints.