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Frozen sections of mouse thymus (a, c, and e) and human thymus (b, d, and f) incubated with scFvs derived from MoPhabs TB4–4 (a and b), TB4–20 (c and d), and TB4–28 (e and f). C, cortex; M, medulla; HC, Hassal’s corpuscle; c, capillary. (×105.)
