A single nucleotide addition followed by a single nucleotide deletion approximately 20 bp apart in the DNA causes a change in the protein sequence from
-His-Thr-Glu-Asp-Trp-Leu-His-Gln-Asp-
to -His-Asp-Arg-Gly-Leu-Ala-Thr-Ser-Asp-
Which nucleotide has been added and which deleted? What are the original and the new mRNA sequences.