RNAreprogramming represents anewconcept incorrecting genetic defects at theRNA , for the technique to be useful for therapy, the level of reprogrammingmust be appropriate. To improve the efficiency of group I ribozyme-mediated RNA reprogramming, when using theTetrahy-menaribozyme, regions complementary to the target RNA have previously been extended in length and accessible sites in the targetRNAs have been identified.