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。

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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。

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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。

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The H2B program is on an annual renewal basis in Congress, and that gets a little hairy.

NPR: One Employer's View of Guest-Worker Plan

Yes, he says, there's certainly widespread abuse when it comes to H2B visas.

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Last year, when we visited Motivatit Seafoods in Houma, Louisiana, we met a group of Mexican women who were brought into the United States with H2B visas, part of the guest-worker program.

NPR: One Employer's View of Guest-Worker Plan