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Catfish intestinal loop histology 6 h postinoculation with peptidoglycan. (A) Mock, periodic acid-Schiff (PAS) stained. (B) Pepetidoglycan, PAS stained. (C) Mock, hematoxylin and eosin (HE) stained. (D) Peptidoglycan, HE stained. (A and C) Mock intestinal loops were injected with 1 ml of saline (NaCl, 0.85%). (B and D) Intestinal loops injected with 1 ml of peptidoglycan (100 μg). These experiments were repeated 2 to 3 times independently.
