melanin [ˈmɛlənɪn]

例句:

• Genetic mutations that affect the production of a pigment called melanin.
  来自SA
• The production of melanin in the skin is stimulated by exposure to the sun.
  皮肤暴露在阳光下就很容易生成黑色素。
  
• Freckles are simply concentrations of melanin.
  雀斑不过是高浓度的黑色素.
  
• Promote the blood circulation, and accelerate the melanin's decomposition and absorption.
  促进血液循环, 加速黑色素的分解与吸收.
  
• Their cell walls contain high levels of melanin, a dark pigment producing their black appearance.
  来自BBC
• "Melanin is quite a tough protein," Benton pointed out at the press conference.
  来自SA