  Information on the intrinsic deformation of the proton can be obtained by
studying the electromagnetic p-->Delta+ quadrupole transition. Recent
experiments have shown that the electric quadrupole (E2) strength in gamma p
--> Delta+ is about 10 times larger than predicted by the simple quark model
using only one-body currents. Our analysis provides evidence for the dominance
of exchange currents in the N-->Delta quadrupole transition and identifies the
physical mechanism leading to the observed E2 strength.
