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Fig. 4 Sex determining region (SDR) analysis in radial fins fish. A. The genomic synteny among the twenty-two fishes. Phylogenetic relationship of golden pompano and relevant twenty-one teleost lineages, and chromosome evolutions of the twenty-two teleosts. Divergence ages are shown on the joinpoints of the tree. The divergence age was estimated using the nodes with calibration times derived from the Time Tree database. Ages do not represent the exact point estimates. Chromosome evolutions were analyzed according to the multicollinearity among chromosomes of lineages. The chromosome number of golden pompano was shown. The bright blue boxes with labeled chromosome numbers represent the known SDRs in other lineages. The dark blue, green, brown, purple and yellow box means the clinearity of other fishes with corresponding to known SDR-linked Chromosome XXII, 3, 12, 15, and 12. B. Micro-colinearity between golden pompano and the S. dumeri at SDR. Scaffolds (NW_019174299.1 and NW_019174424.1) were homologues with the SDR of golden pompano. C. Genomic locations of the golden pompano SDR genes and SDR-homologous genes in golden pompano. SDR genes previously reported in other fishes (see species name in the picture) were used for localized the homologous genes in golden pompano. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)