Figure 5 .

Clusters of non-homologous, defense-related genes in the genome ofA.thaliana.(A) Chromosomal distribution of 1594 groups of neighboring genes, which responded differentially (repressed or activated) to various viral infections. (B) Distribution of pathogen-related, co-expressed clusters on the chromosomes of A. thaliana. (C) Comparison between the number of clustered genes obtained from the random distribution data set or found experimentally. The height of the bars represents the number of defense-related gene clusters of the corresponding size either revealed in the experiment (black columns) or estimated by stochastic distribution (unfilled columns).