Xuekui Zhang <xzhang@stat.ubc.ca>, Raphael Gottardo
        <rgottard@fhcrc.org>
methods, stats4, IRanges, GenomicRanges, graphics, grDevices,
stats, Rsamtools, GenomicAlignments, S4Vectors
Probabilistic inference of ChIP-Seq using an empirical
        Bayes mixture model approach.