Comment Re:As usual, the title is wrong! (Score 1) 91
I thought it was quantum chromodynamics mostly (the amount of energy holding quarks together is tremendous).
The "Hadron Masses" page on CERN's "The Particle Adventure" site agrees with you:
In general, only a small part of the mass of a hadron (such as a proton) is due to the quarks in it. Most of a hadron's mass comes from the kinetic and potential energy in the system. (Remember, E=mc^2; we perceive the energy in the system as mass)."