  The relevance of the dipole configurations of quarks in forming nucleus
structure functions is discussed. It is shown that a radiation generated by
dipole configurations while moving relativistically along their axises is
described by distributions which are finite and infrared stable in low
transverse momentum region. It is argued that there is an exponential
transition to the perturbative regime of large transverse momenta and its power
is defined by the distance between the dipole charges in its rest frame
$m^{-1}_\pi$.
