#gauge_boson__gaugeboson  a particle that mediates the interaction of two elementary particles
  supertype:  #boson  any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons
  subtype:  #gluon  a gauge boson that mediates strong interaction among quarks
  subtype:  #gravitons__graviton  a gauge boson that mediates the (extremely weak) gravitational interactions between particles
  subtype:  #intermediate_vector_bosons  a gauge boson that mediates weak interactions between particles
  subtype:  #photon  a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

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