Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Njem: Nucleases bụ enzymes nke na-egbutu eriri DNA site na catalyzing hydrolysis nke phosphodiester bonds. A na-akpọ nucleases nke na-eme ka hydrolysis nke nucleotides site na njedebe nke eriri DNA bụ exonucleases, ebe endonucleases na-egbutu n'ime eriri. Ihe ndị a na-ejikarị eme ihe n'ihe ọmụmụ banyere ụmụ irighiri ihe ndị dị n'ahụ́ bụ ihe ndị a na-akpọ restriction endonucleases, bụ́ ndị na-egbutu DNA n'otu oge. Dịka ọmụmaatụ, enzyme EcoRV nke egosiri n'aka ekpe na-amata usoro 6-base 5′-GATATC-3′ ma mebie ya na ahịrị kwụ ọtọ. Na okike, enzymes ndị a na-echebe nje bacteria megide ọrịa phage site na ịgbari DNA nke phage mgbe ọ batara na mkpụrụ ndụ nje, na-eme dị ka akụkụ nke usoro mgbochi mgbochi. Na teknụzụ, a na-eji nucleases ndị a akọwapụtara usoro na mmepụta mkpụrụ ndụ ihe nketa na mkpịsị aka DNA.  Ajụjụ: Gịnị ka enzyme EcoRV na-amata?
6-base usoro 5′-GATATC-3