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We thank J. Felsenstein, J. Rohlf, R. Sokal, B. Runnegar, A. Bely, J. Boore, and R. Zardoya for invaluable help with these analyses, and A. Bely, D. Futuyma, D. Jablonski, and A. Knoll for helpful comments on the manuscript Supported by grants from NSF to all three authors and from the A. P. Sloan Foundation to G.A.W.
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