Assertion: rheumatoid arthritis's system | /r/HasProperty | overactive
Facets:
value: for the cartilage
type: PURPOSE
value: for some reason
type: CAUSE
Source sentences:
text: It's an autoimmune disease, which means that the immune system is overactive for some reason that we don’t know and decides to attack the lining of the joints, causing inflammation in the lining, which leads to damage in the joint structures, the cartilage, the bone.
text: Rheumatoid arthritis (RA) is a chronic, progressive disease caused by an overactive immune system.