再发生的

The prospect of graft loss is a problem faced by all transplant recipients, and retransplantation is often an option when loss occurs.

移植物失功远景是在所有移植受体面前一个问题，当发生时候再移植通常是一个。

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.

二，新基因复本也可能透转录作用，将基因表现出mRNA转录成DNA序列，再插回基因组内，这种现象称为转录移位（retrotransposition），发生在细胞内称为长散布核因子（LINE）转位子活动时。