通过遗传研究我们已经知道，基因调控方式的微小变更会在短时间内导致解剖学上的重大改变。
We now know from genetic studies that small alterations in the regulation of genes can have major anatomical consequences in a short amount of time.
牛津大学，生理解剖学与遗传学系，高级研究员。
Jill Urban Department of Physiology, Anatomy and Genetics, Oxford, Senior researcher.
请就解剖学、遗传学以及神经传导物质方面讨论这两种疾病的成因。
Discuss the cause of these two diseases in terms of their anatomical, genetic and neurotransmitter basis.
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