Assertion: hair follicle | /r/HasAspect | upper permanent bulgeregion
Facets:
Source sentences:
text: Hair follicles have an upper permanent (bulge) region containing hair follicle stem cells and a lower temporary (bulb) region that periodically dies out and is regenerated again from the permanent region (Blanpain and Fuchs, 2006, 2009; Cotsarelis, 2006)