Chromosomal distribution of probe intensities. The 100-kb sliding window averages for At (red), Aa (blue), As (gold), and F
As (brown) on chromosome 4. Chromosome positions and gene annotations correspond to the At genome. Gray boxes indicate clusters containing at least 30 genes with a strong unidirectional bias, where at least 27 genes have the same bias, and significant for at least 9 genes. A list of clusters can be found in Table 1. Genes within these clusters can be found in Additional file 2.