Fig. 7

The repeatomes of channel catfish and blue catfish and their specific expansion of immunoglobulin-related genes and the Xba elements. Repeatomes of channel catfish and blue catfish. A The most abundant categories of the repeatomes of blue catfish (left) and channel catfish (right), with each category representing at least 1% of the repetitive elements of their repeatome, respectively. The complete list and annotation of their repetitive elements are presented in Additional file 1: Table S14. B Distribution and quantity (in Mb) of immunoglobulin-related proteins (Immunoglobulins) and Xba elements in various catfish species. The amount in Mb of immunoglobulin-related proteins and Xba elements are indicated at the bottom of the figures. Phylogenetic analysis was conducted with cytochrome b sequences, and each bar corresponds to the species within the phylogenetic tree with immunoglobulins in blue, and Xba elements in orange