  In this letter we show that the behaviour of $F_{2}$, at very small $x_B$,
agrees with the behaviour expected from the BFKL evolution equation, when
screening corrections are included. We obtain a description which is consistent
with the data, however, we require the screening corrections to be relatively
large (about a quarter of the total DIS cross section). The relation between
the screening corrections and the diffractive DIS cross section is discussed.
