1. a variant form of a grapheme as `m' or `M'. 
   相同字素的不同形式比如m或者m。
2. an autosomal recessive form of muscular dystrophy characterized by progressive muscular weakness beginning either in the shoulder or pelvic girdle. 
   一种常染色体退缩形式的肌营养不良。
3. A variant shape of a letter. 
   字母的书写变体
4. a disorder of lipid metabolism that is inherited as an autosomal recessive trait. 
   油脂新陈代谢混乱的一种遗传病症
5. an autosomal dominant disease characterized by elongated bones (especially of limbs and digits) and abnormalities of the eyes and circulatory system. 
   一种常染色体显性疾病。

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