Assertion: ankylosing spondylitis's cause | /r/HasProperty | known specific
Facets:
Source sentences:
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.
text: Unfortunately, ankylosing spondylitis has no known specific causes, although research continues to determine what sparks the disease.