Assertion: virus's protein | /r/CapableOf | enable the virion
Facets:
value: to penetrate the host cell membrane
type: PURPOSE
value: in some cases
type: TEMPORAL
value: to inject the infectious nucleic acid
type: PURPOSE
Source sentences:
text: The capsid has three functions: 1) it protects the nucleic acid from digestion by enzymes, 2) contains special sites on its surface that allow the virion to attach to a host cell, and 3) provides proteins that enable the virion to penetrate the host cell membrane and, in some cases, to inject the infectious nucleic acid into the cell's cytoplasm.