Figure 1From: Divergent effects of muscarinic receptor subtype gene ablation on murine colon tumorigenesis reveals association of M3R and zinc finger protein 277 expression in colon neoplasiaStudy protocol, animal weights, colon length and histological appearance of colon sections from mice with different Chrm genotypes. A: Schematic of study design; WT, Chrm3-/-, Chrm1-/- and dual KO male mice were treated with intraperitoneal injection of AOM (10 mg/kg) or an equal volume of vehicle (phosphate buffered saline) weekly for 6 weeks and followed for a total of 20 weeks. At 20 weeks, animals were euthanized and colon tumor number and size, and mucosal markers of proliferation and apoptosis were measured. B: Weights of AOM-treated mice during the 20-week study (mean ± S.E.). C: Colon length of AOM-treated mice was measured following euthanasia at 20 weeks (mean ± S.E.). D No morphological differences were seen in hematoxylin and eosin (H&E)-stained microscopic sections of normal colon tissue from WT, Chrm3-/-, Chrm1-/- and dual KO mice. Size bars = 50 micrometers.Back to article page