Assertion: sweat gland | /r/CapableOf | pose formidable challenge
Facets:
value: to researchers
type: TRANSITIVE-OBJECT
Source sentences:
text: Sweat glands have posed a formidable challenge to researchers because in contrast to humans, where sweat glands and hair follicles coexist, sweat glands in most mammals, including the laboratory mouse, are restricted to tiny regions that are hairless, like the paw.