Assertion: ankylosing spondylitis's type | /r/HasSubevent | new bone formation
Facets:
value: in the spine
type: LOCATION
Source sentences:
text: One is that the HLA-B27 gene may allow certain types of bacteria to thrive and overstay their welcome—possibly resulting in the type of inflammation that can lead to new bone formation in the spine, where it would not normally exist.