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The basic level of chromatin organization, each nucleosome contains 146 base pairs of DNA wrapped around a core of eight histone proteins. The fundamental structural unit of eukaryotic chromosomes. It consists of pairs of each of the core histones (H2A, H2B, H3 and H4), thereby creating the histone octamer, and a single molecule of the linker histone H1.
http://www.google.co.uk/search?hl=en&q=define:nucleosome&btnG=Search&meta= Нуклеосома - это структурная часть хромосомы, образованная совместной упаковкой нити ДНК с гистоновыми белками H2A, H2B, H3 и H4
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