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Within the Schwinger-Dyson equation approach to calculate structure of bound states under quantum field theory dynamics, one applies truncation schemes such that the finite tower of integral equations for Green's functions becomes manageable. For hadrons (mesons and baryons) as relativistic bound states of quarks and gluons interacting via the strong nuclear force, a well-adopted scheme is the rainbow-ladder truncation. Particularly the bound state amplitude (Bethe-Salpeter amplitude) of mesons is determined from the homogeneous Bethe-Salpeter equation. While the amplitude for baryons is solved from the Faddeev equation. Information on the structure of hadrons is contained within these amplitudes. The established quantum field theory of the strong interaction is quantum chromodynamics (QCD). The Maris-Tandy model is a practical case of the rainbow-ladder truncation that yields reasonable description for hadrons with up quarks, down quarks, and strange quarks as their valence quarks.[1]