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Confocal imaging of primary roots of 5-day-old A. thaliana seedlings expressing UBQ10:GCaMP3. Representative bright-field and corresponding single-optical section confocal images of the root tip with a focus on the root cap (A), meristem (B), and elongation zone (C,D). c = columella; end = endodermis; epi = epidermis; cor = cortex. Scale bar: 50 μm.
