A program for constructing nucleosome formation potential profile was applied 
for investigation of exons, introns, and repetitive sequences. The program is 
available at http://wwwmgs.bionet.nsc.ru/mgs/programs/recon/. We have 
demonstrated that introns and repetitive sequences exhibit higher nucleosome 
formation potentials than exons. This fact may be explained by functional 
saturation of exons with genetic code, hindering the localization of efficient 
nucleosome positioning sites.