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"James McInerney" <james.o.mcinerney at may.ie> wrote in message news:9lu8dk$eqb$1 at mercury.hgmp.mrc.ac.uk... > Hi all, > > Cryptic question: > > What would cause an excessively high number of silent sites being > monomorphic in a population? > Social mores? Des > > James > > --- > > ---