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Phylogenetic tree of Bilateria based on Bayesian inference (BI), showing the position of Pikaia and other Cambrian deuterostomes. Branch lengths are proportional to the number of character state changes (scale bar on the bottom left). Node numbers indicate posterior probability values (BI). Tie plots show reconstructed ancestral state probabilities (0% to 100%; legend on the bottom right) at their corresponding nodes. Yellow background shading denotes ambulacrarians; purple, stem-group chordates; red, crown-group chordates.

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