Levels of apoptosis in distal colon tissue were determined using the TdT-mediated dUTP nickend labeling (TUNEL)method. Tumor specimens from mice were fixed in 10% formaldehyde, embedded in paraffin and sectioned into 5 μm thick slices. Tissue sections were processed according to manufacturer’s instructions for the Apop Tag Peroxidase In Situ Apoptosis Detection Kit (Vector Laboratories; Burlingame, CA, USA).
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