Certain genes can be switched off to prevent melanocytes from maturing.

某些基因可以被关闭以防止黑素细胞成熟。

The melanocytes make the pigment, which is then packed into small packets of pigment called melanosomes.

黑素细胞制造色素，然后将成称黑素体的小色素。

Hair color comes from melanin, a pigment made by special cells called melanocytes.

发色源自黑色素，这种色素由名黑素细胞的特殊细胞生成。

But as we age, there's declining levels of catalase, and this allows the build-up of hydrogen peroxide in the hair bulb, which damages and destroys the melanocytes, or the pigment producing cells, of our hair.

但随着年龄的，氧化氢酶的水平会下降，这使得氢氧化物在毛囊中积累，从而损害并破坏产生色素的黑素细胞。

And it doesn’t affect melanocytes, so for young people, the hair that falls out grows back its normal color.

而且它不会影响黑素细胞， 因此对于年轻人来说， 掉下来的头发会出原来的颜色。

How long your melanocytes last—and therefore when you “go gray”—is mostly determined by your genetics.

你的黑素细胞能存活多久——因此你什么时候“变灰” ——主要由遗传因素决定。

Each hair gets its color from melanin, a pigment made by specialized cells called melanocytes in hair follicles.

每根头发的颜色都来自黑色素， 这是一种由毛囊中专门的细胞——黑素细胞制造的色素。