The repressive mark was composed of three methyl groups attached to a lysine on the H4histone.
抑制性标记由3个甲基基团组成，结合到组蛋白H4的一个赖氨酸残基上。
2
It ensures that the H4 histones have plenty of attached acetyl groups, so the DNA wrapped around the histone once again becomes available for transcription.
它保证了H 4组蛋白有大量的乙酰基团粘附其上，所以环绕在组蛋白上的DNA能再次被翻译。
3
Histone H3 along with H2A, H2B, and H4 form the eukaryotic nucleosome octamer core.