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The families of the ion-channels in opisthokont evolution. Both trees contain similar topologies. The lengths of the branch of the left tree are actually net gain, gains-losses. The lengths of the branch of the right tree are the percent loss, losses-gains as a% of the parent copy number. Total ion channel numbers in every taxon are presented on the left tree. Two animal branches having large loss events have been labeled-the common deuterostome and ecdysozoan ancestors.
