Assertion: lymphatic system's vessel | /r/HasAspect | pocketlike valves
Facets:
value: in mammals
type: OTHER
value: in man
type: LOCATION
value: in birds
type: OTHER
Source sentences:
text: In birds, mammals, and man, the vessels have pocketlike valves that allow the lymph to flow in one direction only.
text: In birds, mammals, and man, the vessels have pocketlike valves that allow the lymph to flow in one direction only.