Additional File 1.

Principal components analysis of microarray data from the 5 sets of monozygotic twins with ASD, with each color representing a separate pair of twins. This figure shows that genotype is a major contributor to variations in overall gene expression profile. Each point on the graph represents a dye-reversal experiment on a given twin pair. Note that even the 2 pairs of twins who share the same mother but have different fathers (pink and yellow points) are distinguishable from each other.

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Hu et al. BMC Genomics 2006 7:118   doi:10.1186/1471-2164-7-118