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Transmission electron micrographs showing endophytic colonization of corn tissues by Penicillium citrinum. The attachment of hyphae (Hf) to cell membranes (Cm) of infected (A) root (Magnification 2500×); (B) stem (Magnification 12500×); and (C) leaf (Magnification 2000×). The penetration peg is marked with an asterisk (*).
