For example, the following code in Listing 8 italicizes only an h4 element that follows another h4 element, so the first h4 element remains unchanged, as shown in Figure 6.

例如， 清单 8 中的代码只选择另一个 h4 元素后面的一个 h4 元素并把它设置为斜体，所以第一个 h4 元素保持不变，见 图 6。

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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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A small molecule called an acetyl group attaches to a particular histone known as H4.

一个小小的分子称作一个乙酰基团，它黏在一个称作h4的特殊组蛋白上。

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Harrison radically re-thought his design and produced H4, a timekeeper that resembled a large pocket watch.

BBC: Longitude clock comes alive

Yet, 200 years ago, H4's accuracy would have seemed, as it did to the astronomers, simply unbelievable.

BBC: Time to make history

"What it does is it brings things into a more realistic perspective, " says Neale Smiles, business director of military training company H4 Global.

BBC: Star Trek 'holodeck' in the living room?