The process that led to Dolly began with the transfer of the nucleus of an adult cell to an unfertilised egg taken from a donor animal by a process known as cell fusion.

• 多利诞生的过程是这样开始的：通过一个叫细胞合成的过程，把一个成体细胞核移植到一个取自供体动物的未受精的卵子上。