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Surface morphology of Arabidopsis SCE cells. Scanning electron micrographs of mature, dry seeds are shown. The letter c marks the center of volcano-shaped columellae, which are not detected in F. Asterisks mark small remnants of columellae in H. White dashed lines highlight the size of columellae, while black dashed lines highlight primary walls surrounding epidermal cells. Bars = 20 µm.
