  Interaction with a nucleus in pA collisions enhances the higher Fock
components in the projectile proton. Effectively, this corresponds to an
increase of the hard scale of the process by the saturation momentum Q^2 ->
Q^2+Q_{sA}^2, which leads to an increased gluon distribution function at small
x (but suppressed at x -> 1) compared to that in pp collisions. In the case of
AA collisions the gluon distributions of bound nucleons in both nuclei turn out
to be enhanced, i.e. to be boosted to higher saturation scales compared to pA
collisions. A set of bootstrap equations relating the saturation scales in the
colliding nuclei is derived and solved. The boosting effect has a moderate
magnitude at the energies of RHIC, but becomes significant at LHC.
