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. 2016 Jun 27;6:28598. doi: 10.1038/srep28598

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(a) A variegated variety of ‘Marble Queen’ plant showing green and white leaf sectors. Red arrow indicates a petiole. (b) Its fully expanded leaf shows a typical venation pattern commonly observed in dicots. (c) A cross section of its stem shows ‘compound’ vascular bundles distributed in two separate layers: a ring in the outer layer and scattered in the inner layer. Scale bar = 200 μm. (d) Detailed vascular bundles for outer layer (black box in c.). Scale bar = 50 μm. (e) Detailed vascular bundles for inner layer (white box in c.). Scale bar = 50 μm.