色素缺乏的

The most common cause for a hypochromic microcytic anemia is iron deficiency.

小细胞低色性贫血最主要的原因是铁缺乏。

Oculocutaneous albinism(OCA) is a group of autosomal recessive disorders of melanin synthesis,which is characterized by congenital hypopigmentation of skin,hair and eyes.

眼皮肤白化病是由于黑色相关基因突变导致眼、皮肤、毛发黑色沉着减少或缺乏引起的一类常染色遗传疾病的总称。