Fig. 4.

Examples of duplicated genes. a to c) Sequencing read coverage plots of the collapsed duplications containing KCNMB1, FZD5, and MT1X genes. Average coverage is shown in panels (a) to (c) in the dashed red line. MT1X duplication is partially resolved, as evidenced by the four resolved copies of the gene, shown as boxes. d) Genomic region containing XRCC1 in blue whale and vaquita. XRCC1 genes are highlighted in red and labeled by the gene name. The second XRCC1 locus in the blue whale is labeled by its locus number, LOC118885654. This locus also has an increased read coverage, suggesting an unresolved third copy; see supplementary fig. S5, Supplementary Material online.