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Transverse sections of CCs in the transport phloem. A, C. maxima; the dense cytoplasm contains many small vacuoles or vesicles. B, L. salicaria; a fragmented vacuole is present. C, V. faba; cell wall protrusions (arrows) occur on all sides except at the SE/CC interface. The vacuole is unfragmented. D, Z. elegans; small cell wall protrusions (arrows) occur on all sides except at the SE/CC interface. Bars = 1 μm.
