Additional file 4.

Cluster D is not shown, as it contains only one gene. The clusters are grouped based on statistical significance in pairwise comparisons of transcriptome data at pH values of 2.5, 4.5, and 6.0. Each cluster has nine values. The first three are biologic replicates at pH 2.5; the middle three are at pH 4.5; and the last three are from pH 6.0. The genes are clustered by using Matlab and the ClustreLustre algorithm [58].

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Andersen et al. Genome Biology 2009 10:R47   doi:10.1186/gb-2009-10-5-r47