After treatments, all rats were sacrificed simultaneously. Approximately 6 cm of the colon lesion was reserved at 6-8 cm distance from the anus. A 1-cm length of the dissected colon was removed, washed with iced saline, fixed in 10 % formalin, embedded in paraffin, sectioned, stained with hematoxylin and eosin, dehydrated in 95, 90, and 70 % ethanol, cleared in xylene, mounted in Permount or Histoclad, and observed under a light microscope.
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