Figure 2
Histograms of the log 2 values of the normalized average signal intensities for all microarray experiments. (P): Phototrophic cultures; (M): mixotrophic cultures; and (H): heterotrophic cultures. Black: signal distribution in whole filaments; gray: signal distribution in vegetative cells; and white: signal distribution in heterocysts. Left panels: all genes; right panels: reduced sets of genes (see Additional files5 and6; P: 3,949 genes; M: 3,885 genes, and H: 3,933 genes).