黑素的多少决定了雀斑，但是这与成团的黑色素细胞是有很大不同的。
The concentrations of melanin that are responsible for freckles are much different than clusters of melanocytes, which is associated with skin cancer.
阳光能够刺激黑色素细胞产生黑素，这是因为黑素要在紫外线的辐射下保护我们的身体。
Sunlight is therefore a stimulus for melanocytes to produce melanin because they are trying to protect the body from UV rays.
这种情况就是说黑色素细胞因遭到免疫系统攻击而变得虚弱，从而无法产生黑素。
There is an autoimmune condition called vitiligo in which melanocytes are attacked by the immune system and become too weak to produce melanin.
有雀斑的人呢，他们的黑色素细胞数量是正常的，只是他们的黑色素细胞产生了一些黑素。
People with freckles have a normal number of melanocytes; their melanocytes just create clusters of melanin.
因为鸟类羽毛和爬行动物的鳞片都包含黑素体——这是一种微小的囊状结构，其中包含了各种各样的黑色素，于是很多古生物学家开始怀疑恐龙羽毛是否也含有黑素体。
Bird feathers and reptile scales contain melanosomes-tiny sacs holding varieties of the pigment melanin. Many paleontologists suspected that dinosaur feathers also contained melanosomes.
在褐色头发、黑头发和金发的人群中，黑素皮质素受体基因(melanocortin - 1receptor)能分泌黑色素。
In people with brown, black and blond hair, the gene, for the melanocortin-1 receptor, produces melanin.
测定壬二酸对人表皮黑素细胞和鼠黑色素瘤B16细胞酪氨酸酶活性及黑素含量变化观察壬二酸的脱色素作用。
The influence of azelaic acid on melanin synthesis and tyrosinase activity of human melanocytes and murine B16 melanoma cells were studied.
黑素小体是合成和贮存黑色素的场所。
Melanosomes are unique organelles within which melanin pigments are synthesized and stored.
有些人会用漂白来去掉雀斑。他们用一种含有对苯二酚的药，这种药能够减缓黑色素细胞产生黑素。有一种自身免疫系统引发的问题叫做白癜风。
Some people try to get rid of freckles through a bleaching process involving an agent such as hydroquinone that slows down the process at which melanocytes produce melanin.
有些人会用漂白来去掉雀斑。他们用一种含有对苯二酚的药，这种药能够减缓黑色素细胞产生黑素。有一种自身免疫系统引发的问题叫做白癜风。
Some people try to get rid of freckles through a bleaching process involving an agent such as hydroquinone that slows down the process at which melanocytes produce melanin.
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