| phasing of nucleosomes | <molecular biology> A nonrandom arrangement of nucleosomes on DNA, in which, at certain segments of the genome, nucleosomes are positioned in the same way relative to the nucleotide sequence in all cells. most nucleosomes are arranged randomly, but phasing has been detected in some genes. (31 Dec 1997) |
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| nucleosomes | The repeating structural units of chromatin, each consisting of approximately 200 base pairs of DNA wound around a protein core. This core is composed of the histones h2a, h2b, h3, and h4. (12 Dec 1998) |
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