Assertion: proton | /r/HasAspect | quark content of uud
Facets:
Source sentences:
text: The proton has quark content of uud, and the neutron, udd.
text: The proton has quark content of uud, and the neutron, udd.
text: The proton has quark content of uud, and the neutron, udd.
text: The proton has quark content of uud, and the neutron, udd.