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,新本也可能透过录作用,将表现出来mRNA录成DNA序列,再插回组内,这种现象称录移位(retrotransposition),发生在细胞内称长散布核子(LINE)位子活动时。