Eye color is also related to melanin.

眼睛的颜色与黑色素有关。

But some of them happened to produce less melanin.

比如钙，铁，镁，磷酸盐，锌。

This pigment ratio is controlled by a gene, which also controls the melanin in our skin.

这色素比例是由个基因控制的，这个基因也控制着我们的黑色素。

The melanin is what darkens your skin.

黑色素使变黑。

The melanin makes the color of the eyes?

黑色素决定了眼睛的颜色？

The more melanin you have, the darker your skin.

你拥有的黑色素越多，你的越黑。

OCA2 is responsible for a protein called melanin in our eyes.

OCA2 负责我们眼睛叫做黑色素的蛋白质。

For light-skin people, that extra melanin darkens their skin and produces a tan.

这取决于阳光照射时的反应。

Some are yellow others are red and some contain the dark melanin pigment.

有些是黄色的，有红色的， 同时也有些有深深的黑色素。人们以为。

The melanin levels in a baby's eyes determine how dark their eyes become.

婴儿眼睛的黑色素水平决定了他们的眼睛变黑的程度。

If they can't mature, they won't be able to produce melanin.

如果它们不能成熟，就不能产生黑色素。

My eyes have a lot of melanin, that's why they are dark brown.

我的眼睛有很多黑色素，所以是深褐色的。

Your eyes don't have any pigment or melanin in them.

你的眼睛没有黑色或其他色素。

Melanocytes associated with the hair root will deposit melanin to the cells that compose our hair.

与发根相关的黑色素细胞会将黑色素沉积到构成我们头发的细胞。

However, for those one in 100, the amount of melanin in each eye isn't uniform.

然而，对于这分之的人来说，每只眼睛黑色素的数量并不均匀。

Where melanin isn't produced, those areas will turn white, which is why people get white hair.

在黑色素不产生的地方，这些区域就会变白，这就是为什么人们会有白头发。

Squid ink is made mostly of mucus and melanin, which produces its dark coloring.

乌贼墨水主要由粘液和黑色素组成，从而造成了深色。

Thus, melanin production can be controlled by a few genes being turned on and off.

因此，黑色素的产生可以由些基因的开启和关闭来控制。

It gets its color from two types of melanin: brown-black eumelanin and red-yellow pheomelanin.

棕黑色的真黑色素和红黄色的褐色素。

Since melanin is a light brownish, tan colored pigment, so are our freckles.

因为黑色素是浅棕色或者是棕褐色的色素，我们的雀斑也是这个颜色。