The first step in the development of recombinant DNA technological know-how was the characterization of restriction endonucleases—enzymes that cleave DNA at particular sequences. These enzymes ended up identified in germs, wherever they apparently supply a protection versus the entry of foreign DNA (e. Not merely DNA, and also RNA sequences https://goodenergyhealth.com/pioneering-the-future-genscripts-expertise-in-recombinant-vaccines/