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1·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.

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。

2·Histone H3 along with H2A, H2B, and H4 form the eukaryotic nucleosome octamer core.

组蛋白 H3 与 H2A，H2B，H4 共同构成了真核生物核小体的八聚体核心。

3·Histone H3 is one of the four histones, along with H2A, H2B, and H4, which form the eukaryotic nucleosome octamer core.

组蛋白H3与其他类型的组蛋白分子H2A， H2B， H4共同构成了真核生物核小体的八聚体核心。