Assertion: ankylosing spondylitis's type | /r/Causes | inflammation
Facets:
value: primarily
type: DEGREE
value: in joints
type: LOCATION
Source sentences:
text: Interleukin (IL)-23 is believed to activate a certain type of immune system cell that travels to the bones and joints and causes inflammation, contributing to many of the symptoms seen in ankylosing spondylitis  .
text: Peripheral spondyloarthritis: This type of spondyloarthritis primarily causes inflammation in joints other than the spine.