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CD31 immunohistochemical staining. Representative histology sections of lung tissue at 2 and 6 h by CD31 immunohistochemical staining (×200) at 2 and 6 h (N = 6). CD31 is a specific marker for endothelial vascular lesions. Compared with NC group, there was positive staining signal clearly in M group. However, vascular endothelium of early pre-treatment with Fusu agent is clearer and vascular integrity is recognizable
