Talking Glossary of Genetic Terms

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Christopher P. Austin, M.D. defines Chromatin

Chromatin

KROH muh tin

Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell's genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus. Changes in chromatin structure are associated with DNA replication and gene expression.

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