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A dendrogram of the mean values of the Dice coefficients for pairwise comparison of the denaturing gradient gel electrophoresis (DGGE) profiles of the ileal flora in piglets of different ages reared under low- and high-hygiene conditions. Outlying piglets (i.e. those that are either of a different age or reared under different conditions to the majority of animals in the indicated group) are listed in red. Dashed lines indicate the borders between the five separate (numbered) clusters.
