The core consists of 140 base pair of DNA wrapped around a globular histone bead containing two each of histones H2A, H2B, H3 and H4.
核小体核心由140个碱基对的DNA围绕一个组蛋白小球组成，每一个组蛋白小球包含两个H_2A、H_2B、H3和H4的四聚体分子。
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。
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