Assertion: electron | /r/MadeOf | two down quarks
Facets:
value: into a proton
type: OTHER
Source sentences:
text: Flavour can change in particle reactions only through the agency of the weak force, as when, for example, a muon changes into an electron or a neutron (containing two down quarks and one up quark) transmutes into a proton (made from two up quarks and one down quark).