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In a study of mammalian ribonuclease evolutionary rates, we applied the Fitch-Bruschi correction to reduce the bias caused by an unequal sampling of taxa in different lineages. The correction was clearly appropriate but only up to a point. The analysis showed that the sampling of taxa within the pecora was sufficiently intense that no correction for unseen, amino acid-changing, nucleotide substitutions was required. It was also found that the ribonuclease gene was duplicated at least twice at the origin of the pecoran branch of the artiodactyls.

Correcting parsimonious trees for unseen nucleotide substitutions: the effect of dense branching as exemplified by ribonuclease.