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This tests directly whether fast-moving bound nucleons have modified quark distributions.","posed_since":"","precise":"Measure the struck-nucleon structure function in $d(e, e' N_s) X$ as a function of $x'$ and spectator momentum $p_s$ from $0.25\\text{ to }0.6\\ \\mathrm{GeV}/c$ (JLab BAND and LAD experiments), and determine whether $F2_{\\mathrm{bound}}/F2_{\\mathrm{free}}$ scales with the virtuality $v = (p^\\mu p_\\mu - M^2)/M^2$ as SRC models predict. 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