通过点变异和基因删除方法对M和NS基因进行改进；
It is also improved M and NS genes by a site mutation and a gene deletion method.
接着，他们用另外的工程删除在肺部接收胸腺基质淋巴细胞生成素的感受器分子的基因。
Then they used additional engineering to delete the gene for the receptor molecule which picks up TSLP in the lungs.
该研究同时指出，另一处基因序列的删除可能导致了人脑特定区域的扩张。
It suggests another genetic deletion may have led to the expansion of specific regions of the human brain.
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