Additional file 2.

Figure S1. Hierarchical clustering of uncorrected and batch-corrected data from time point 0: a) The uncorrected data form clusters reflecting the 2 different years of acquiry (red shades for arrays generated in 2006; blue shades for those generated in 2009). In contrast, RA and OA are not grouped. b) The ComBat-corrected data (2 batches) still fail to form clusters reflecting the diseases (RA and OA).

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Kupfer et al. BMC Medical Genomics 2012 5:23   doi:10.1186/1755-8794-5-23