The total incidence of intracranial leukemic nfiltration in 50 leukemic autoptic cases was 90%.
50例白血病尸检患者的白血病细胞颅内浸润总
率为90%。
Alternatively, a new version of a gene can also be created through reverse transcription: during gene expression, the mRNA is copied back into a sequence of DNA that is inserted into the genome.
其二,新的基因复本也可能透过反转录作用,将基因表

的mRNA反转录成DNA序列,再插回基因
内,这种
象称为反转录移位(retrotransposition),

细胞内称为长散布核因子(LINE)的转位子活动时。
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学基础入门 

听 I mean, as soon as an organism evolves to have multiple specialized cells working together for the good of the whole, there's serious evolutionary pressure to make sure that one cell doesn't mutate and try to out-compete all the rest.
我的意思是,一旦一个有机体为了整体的利益而协同工作而进化为具有多个专门的
,就会存在严重的进化压力,以确保一个
不会发生突变并试图在竞争中胜过所有其他
。
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