Coalesce fits the model which has a single population of constant size, and estimates 4Nu, where N is the effective population size and u is the neutral mutation rate per site Coalesce forms part of the Lamarc (Likelihood Analysis with Metropolis Algorithm using Random Coalescence) suite. See: http://evolution.genetics.washington.edu/lamarc.html WWW: http://evolution.genetics.washington.edu/lamarc/recombine.html -- Johann Visagie