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Cytoscape networks of ascidians evaluated using different categories of hosts and location. (a) Significant clustering of ascidians according to location, where each color indicates a location. (b) Ascidians are still clustered by location even after redefining the host species grouping at different levels and excluding ascidian groups that had only been collected at the same location. The grouping shown here is defined in map 3 of Supplementary Table S5.
