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When are two qualitative taxonomic characters compatible?

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Summary

A proof is given of a procedure that has previously appeared claiming to determine when two amino acid positions on a protein could both possibly be divergent taxonomic characters. An algorithm for executing this procedure is described.

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Estabrook, G.F., McMorris, F.R. When are two qualitative taxonomic characters compatible?. J. Math. Biology 4, 195–200 (1977). https://doi.org/10.1007/BF00275985

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