  We re-examine the large-x neutron/proton structure function ratio extracted
from the latest deuteron data, taking into account the most recent developments
in the treatment of Fermi motion, binding and nucleon off-shell effects in the
deuteron. Our findings suggest that as x->1 the ratio of the neutron to proton
structure functions (F_2^n/F_2^p) is consistent with the perturbative QCD
expectation of 3/7, but larger than the value of 1/4 obtained in earlier
analyses.
