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Small intestine samples from germfree mice in the following groups: SCFA/O+Sal (A), Sal/O+Ara-C (B), SCFA/IG+Ara-C (C), and SCFA/O+Ara-C (D). The histologies of SCFA/O+Sal and Sal/O+Ara-C groups are used as representatives of control and Sal+Ara-C groups, respectively.
