Additional file 1.

Supplementary Information. This is a PDF file describing some additional details of the described methods including (i) a description of the proposal distribution for trees used in the RLC model and (ii) a summary of the analysis of the influenza data using a "fixed epoch" model that allows the rate of evolution to change at a specific time in the past.

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Drummond and Suchard BMC Biology 2010 8:114   doi:10.1186/1741-7007-8-114