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Xenograft histology in 30-min biopsies. (A, B) GT+ cardiac xenograft biopsy; (C, D) GTKO biopsy; (A, C) hematoxylin-eosin stain; (B, D) IgM staining. The IgM staining in B and D was scored diffuse 2. Parallel staining for C5d was negative (data not shown).
