Visual inspection can help reveal patterns that would be computationally
rather difficult to reveal. We consider three different algorithms for
visualizations of a DNA sequence and its nucleotide content: random walk,
fractal and visualization based on the entropy-like parameters calculated
using a sliding window. We present a program that uses these three methods
and visualizes either the whole of a given sequence, or specified fragments.
It also provides facilities to compare visualizations obtained for different
sequences/fragments. Random walk visualization considers the sequence
symbol-by-symbol; the other two methods also take into account how well
nucleotides are "mixed" in the sequence. It allows an easy revealing of the
repeated patterns, segments with a low content of some nucleotides, etc.