Using the rate of sequence decay relative to the parent genes to determine their age, it is also clear that many pseudogenes in the human and mouse genomes have arisen at different times.

• 科学家利用伪基因相对于原基因的损毁率来判定它们的形成年代，结果发现人类和小鼠许多伪基因都是在不同时期形成的。