mRNA 5'--G U C CUA CG G AU---3 (+) Insertion-GUAG C CUC AC G GA U Altered amino acid sequences Deletion. - UAC C UA C GG A U (平) Insertion and G U AA G CCA CIG G AU deletion Reading frame restored Genetic studies showed that genetic codons are successive triplets of nucleotidesGenetic studies showed that genetic codons are successive triplets of nucleotides Altered amino acid sequences