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Sampling sites and distribution of mitochondrial cytochrome c oxidase subunit 3–NADH dehydrogenase subunit 1 (COX3-ND1) haplotypes for Ciona intestinalis spA on the west coast and spB on the east coast of North America. Site IDs as per Table 1. Pie charts indicate the proportion of haplotype groups observed at each site, with different colors corresponding to different haplotypes.
