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Representative photomicrographs of lung allografts at day 7 after transplantation (H&E, magnification ×200). (a) Group A allograft: severe leukocyte infiltration and cuffing formation in the perivascular space (RS = 3). (b) Group B allograft, (c) Cont-B allograft: weak rejection; perivascular infiltrates present without extension into alveoli (RS = 1).
