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Distribution of the number of sRNA reads mapping to individual EST clusters. The x axis shows log2-transformed length-normalized read counts, where the numbers of sRNA reads mapping to each EST cluster are normalized by dividing by the length of the cluster and multiplying by the average read length (21 nt). Mean and median of nontransformed data for the two classes of genes are 4.4 and 0.07 for non-NBS-LRR genes and 241 and 10.0 for NBS-LRR genes, respectively.
