  We introduce a generalized definition of parton distribution functions (PDFs)
for a more consistent all-order treatment of power corrections. We present a
new set of modified DGLAP evolution equations for nuclear PDFs, and show that
the resummed $\alpha_s A^{1/3}/Q^2$-type of leading nuclear size enhanced power
corrections significantly slow down the growth of gluon density at small-$x$.
We discuss the relation between the calculated power corrections and the
saturation phenomena.
