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Transmission electron micrographs showing the subcellular distribution of cysteine in Nicotiana tabacum cv. Samsun NN leaf cells of mock- (a) and TMV-inoculated (b-d) plants grown without sulfate at the day of inoculation (a), 1 (b), 2 (c) and 4 (d) days after inoculation. C = chloroplasts, CW = cell walls, M = mitochondria, N = nuclei, Px = peroxisomes, V = vacuoles. Bars = 1 μm.
