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Typical patterns of vascular tissues in 6-week-old A. tumefaciens-induced crown galls on tomato stems observed in thick, longitudinal radial sections cleared with lactic acid and stained with lacmoid. a, Circular vessels surrounded by parenchyma cells in wild-type stems. b, Circular vessels surrounded by fibers in the Nr mutant. Small arrows, Circular vessels; large arrows, fibers. Both photographs are at the same magnification (bar = 100 μm).
