Relationship between nucleosome occupancy and chromatin sensitivity to DNase I digestion. A, Heat map of nucleosome occupancy and open chromatin change. Red represents higher nucleosome occupancy or sensitivity to DNase I digestion in flower than in leaf. Green represents higher nucleosome occupancy or sensitivity to DNase I digestion in leaf than in flower. Chr., Chromosome. B, Nucleosome occupancy and open chromatin dynamics associated with expression of the AP3 gene. Positioned nucleosomes were identified based on MNase-seq data sets and are presented as horizontal bars. The blue double arrow indicates a nucleosome that is detectable in leaf but not detectable in flower.