核小体是染色质的基本单位。

Nucleosome is the basic unit of chromatin.

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真核细胞中，核小体是染色质的基本单位，它由两个拷贝HA、HB、H 和H所组成的核心组蛋白八聚体，及缠绕于其上的bp DNA构成。

In eukaryotic cells, the fundamental unit of chromatin is nucleosome, which is composed of a histone octamer with two copies of HA, HB, H and H and base pairs of DNA.

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