Epigenetics is a type of gene regulation that can be passed from a cell to its daughters. The most common mechanism is methylation.
外因遗传是一种可以传给下一代细胞的基因调控过程，最常见的方式是通过甲基化作用来完成，该作用可以让甲基（由一个碳原子和三个氢原子组成）附着于腺嘌呤或胞嘧啶上。
Genetic damage to cone cells, which causes colour blindness, is the most common type of gene disorder seen in humans.
锥体细胞的遗传缺陷导致了色盲，这是人类最常见的一种基因疾病。
Only five children born in the U.S. annually have the same type of LCA as Morehouse, but focusing on a rare single-gene defect is a good way to develop a model for treating more common ailments.
在美国出生的孩子中，每年只有5个孩子的雷伯氏先天性黑内障与豪斯为同一类型，但是从一个少见的单基因缺陷入手，是开发更普遍的治疗模型的一个很好的途径。
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