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Schematic representation of Arabidopsis anther cross-sections at stages 11 and 12. Distinct cell types are shown with different colors. The tapetum layer is not visible anymore at stage 12. Red bars on the endothecium layer represent secondary thickenings. At stage 12 in this depiction, septum rupture is complete in both locule pairs, while stomium breakage to allow pollen release has only occurred in the right locule pair.
