The epigenome is a molecular marking system that controls gene expression without altering the DNA sequence.

Image credit: Dreamstime表观基因改变DNA序列的前提下控制基因表达的分子标记系统。

Furthermore, PTP1B deletion significantly reduced gene expression of 3 1-adrenergic receptor subtypes, consistent with blunted constriction to phenylephrine.

此外PTP1B缺乏明显减少31-肾上腺受体亚型基因表达，与对苯福林收反应迟钝有关。

This kidney atlas allowsa comprehensive analysis of the progression of gene expression states during nephrogenesis, as well as discovery of potential growth factor-receptor interactions.

图谱使得全面分析肾脏生过程中基因表达状态的展变得可能，除此之外，作者表示它还有助潜的生长因子-受体相互作用。

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，将基因表出来的mRNA反转录成DNA序列，再插回基因组内，这种象称为反转录移位（retrotransposition），生细胞内称为长散布核因子（LINE）的转位子活动时。