...serve as slaves.  Meganucleases In 1989 the first ever DNA-editing enzymes, meganucleases, were discovered...in 1990, just a year after the discovery of meganucleases. The storyline involves the resurrection of ...of all the endonuclease-based gene editors (meganucleases, ZFNs, TALENs, and CRISPR-Cas) is that they ...