Annotation Errors (IMAGE) Washington State University Caption The figure shows examples of different types of annotation errors for the gene, groEL. The black lines represent stop codons, or the signals that tell the machinery to stop protein synthesis. These are the possible tracks where genes could sit; and a gene should not have a stop codon until the end. Credit WSU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.