I have done the complete mitochondrial genome sequence of a mammal. Mitochondrial genome contains 37 genes (13 protein coding genes; 22 tRNA genes and two ribosomal RNA genes). So I want to submit the sequence in Genbank. But the protein-coding genes I have annotated are showing stop codons error, so the Sequin software is giving me a hard time. Kindly tell me the steps how can I make my sequence stop codon free?