Assertion: vein's blood vessel | /r/CapableOf | show erythrocyte
Facets:
value: within its lumen, endothelial cells
type: LOCATION
Source sentences:
text: electron micrograph of a blood vessel showing an erythrocyte (red blood cell, E) within its lumen, endothelial cells forming its(inner layer), and pericytes forming its(outer layer).