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Immunohistochemical detection of Gr-1 (a–d) or collagen (Masson trichrome; e, f) after a sublethal dose of ricin. Mice were instilled with saline (a, b, and e) or 2 μg of ricin/100 g body weight (c, d, and f) and were sacrificed at 48 hours (a–d) or 4 weeks (e and f). br, bronchus. Scale bars: 200 μm (a, c, e, f); 50 μm (b, d). Original magnifications: ×100 (a, c, e, f); ×400 (b, d).
