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Schematic overview concerning the localisation and allocation of the Peyer's patches (PP) used. Ia/Ib: two localisation of jejunal PP's, II: ileal PP, III: ileocaecal-junction, A: Bioassay (0.150 g), B: BioRad TeSeE (0.220 g), C: IDEXX HerdChek (0.350 g), D: PTA-Immunoblot (0.170 g), E: additional PP fixed in 4% neutral buffered formalin.
