  We show that the nearest neighbour distribution of distances between basis
pairs of some intron-less and intron-containing coding regions are the same
when a procedure, called {\em unfolding}, is applied. Such a procedure consists
in separating the secular variations from the oscillatory terms. The form of
the distribution obtained is quite similar to that of a random, i.e.
Poissonian, sequence. This is done for the HUMBMYH7CD, DROMYONMA, HUMBMYH7 and
DROMHC sequences. The first two correspond to highly coding regions while the
last two correspond to non-coding regions. We also show that the distributions
before the unfolding procedure depend on the secular part but, after the
unfolding procedure we obtain an striking result: all distributions are similar
to each other. The result becomes independent of the content of introns or the
species we have chosen. This is in contradiction with the results obtained with
the detrended fluctuation analysis in which the correlations yield different
results for intron-less and intron-containing regions.
