Assertion: decay's proton | /r/HasProperty | down quark
Facets:
Source sentences:
text: For example, a neutron, composed of two down quarks and an up quark, decays to a proton composed of a down quark and two up quarks.
text: For example, a neutron, composed of two down quarks and an up quark, decays to a proton composed of a down quark and two up quarks.