Assertion: eye's cell | /r/CapableOf | block drug
Facets:
value: at the same time
type: TEMPORAL
Source sentences:
text: The cells in the blood vessel walls are joined tightly to one another, forming the blood–brain barrier, which blocks the passage of many toxins and pathogens (though at the same time blocking antibodies and some drugs, thereby presenting special challenges in treatment of diseases of the brain).