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Representative photographs of the intestines, and the body weights and adipose tissue weights, of GF and SPF mice. The ceca are indicated by white arrows in GF (left) and SPF (right) mice at 4 weeks (A) and 8 months (B). Body (C) and adipose tissue (D) weights of GF and SPF mice at the ages of 4 weeks and 8 months during the test period (days 2–6). ****P < 0.001, compared with appropriate control (Tukey–Kramer test).
