  We present results from the theoretical INDO calculations of the electronic
structure for stacked eumelanins' monomers. As basic indolic components of the
eumelanin structure 5,6-dihydroxyindole (DHI or HQ) and its oxidized forms (SQ
and IQ) were chosen. The results reveal dependency of electronic properties of
such aggregates on monomers' redox states. They point out also a tendency to
localize an extra charge on one of dimer's subunits that could be suggestive of
an electron hopping as a model mechanism forthe electron transfer in
eumelanins.
