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Comparisons of adjacent developmental stages. The DGE libraries of four stages were compared to their preceding stage during anther development. MMC has no reference. The number of genes twofold up-regulated or down-regulated at FDR ≤ 0.001 are plotted on the red or black bars in the graph. Among the up-regulated genes at each stage, the numbers of specifically enriched genes (RPKM value ≥ 10) are plotted on the blue bars.
