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Light photomicrograph of paraffin-embedded sections of lung tissues. Over a period of 10 consecutive days, mice were exposed to OVA, and tissues were obtained 48 hours after last exposure. Sections were stained with H&E. Panels represent naive mice (a and b) and mice exposed to OVA in the context of GM-CSF expression (c–f). ×50 (a–d); ×200 (e and f).
