参考文献:10.1186/1756-0500-4-138 摘要:Smith WS, Hale JR, Neylon C. Applying neutral drift to the directed molecular evolution of a β-glucuronidase into a β-galactosidase: Two different evolutionary pathways lead to the same variant. BMC Research Notes. 2011 May 06;4(1):138. doi: 10.1186/1756-0500-4-138.