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Materials

Correction

August 7, 2006 | A version of this story appeared in Volume 84, Issue 32

July 17, cover: In the artist's stylized rendition of a nucleosome, the DNA (olive-colored strand) should have wrapped around the beadlike histone proteins in a left-handed fashion rather than the right-handed fashion shown.

July 17, page 14: The image depicts five tetranucleosomes stacked on each other, amounting to a total of 20 nucleosomes.

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