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.

植物失功远景是在所有植受体面前一个问题，当发生时候再植通常是一个选择。

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，新基因复本也可能透反录作用，将基因表现出来mRNA反录成DNA序列，再插回基因组内，这种现象称为反录位（retrotransposition），发生在细胞内称为长散布核因（LINE）位活动时。