  The ratio ${\mu_p}G_E^p/G_M^p$ exhibits a decrease for four-momentum transfer
Q^2 increasing beyond 1 GeV^2 indicating different spatial distributions for
charge and for magnetization inside the proton. One-gluon exchange currents can
explain this behaviour. The SU(6) breaking induced by gluonic currents predicts
furthermore that the ratio of neutron to proton magnetic form factors
${\mu_p}G_M^n/{\mu_n}G_M^p$ falls with increasing Q^2. We find that the
experimental data are consistent with our expectations of an almost linear
decrease of the ratio ${\mu_p}G_M^n/{\mu_n}G_M^p$ with increasing Q^2,
supporting the statement that the spatial distributions of magnetization are
different for protons and for neutrons.
