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Ultrastructure of leaf chloroplasts from (A) control plant (bar = 1 µm), and plants exposed to (B) 100 µM AgNP-citrate (bar = 2 µm), (C) AgNP-PVP (bar = 1 µm), (D) AgNP-CTAB (bar = 1 µm) and (E) AgNO3 (bar = 1 µm) in liquid ½ strength MS medium.
