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TEM images of roots cross-section: (a) Ana800 treatment, NPs in a vessel (arrows); (b) Rut800 treatment, aggregate with rutile NPs; (c,d) Mix800 treatment, cells with cytoplasm in degeneration state; (e) SMP800 treatment, NPs (arrows); (f) Ana800 treatment, NPs (arrows) crossing ruptures of wall and plasmalemma of adjacent cells. V, vacuole; W, cell wall.
