  An analysis of twist composition of Balitsky-Kovchegov (BK) amplitude is
performed in the double logarithmic limit. In this limit the BK evolution of
color dipole -- proton scattering is equivalent to BFKL evolution which follows
from vanishing of the Bartels vertex in the collinear limit. We perform twist
decomposition of the BFKL/BK amplitude for proton structure functions and find
compact analytic expressions that provide accurate approximations for higher
twist amplitudes. The BFKL/BK higher twist amplitudes are much smaller than
those following from eikonal saturation models.
