Fig. 2
Comparative genome analysis. (A) Maximum likelihood tree P. maxima and 21 other species with 1,000 bootstrap iterations. The scale bar represents 100 million years per unit. In the pie chart, red indicates contracted gene families, green represents expanded gene families, and blue denotes gene families that have neither contracted nor expanded. The stacked bar chart displays the number of genes in each species categorized as: Shared single-copy orthogroups, Shared multiple-copy orthogroups, Species-specific orthogroups, Pinctada-specific orthogroups, and Other genes. (B) Chord plot showing the chromosomal synteny between P. maxima and P. fucata.
