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A) Crypt base columnar cell numbers per crypt of wild type control (C57/Blk6) and p21-null mice at 3 days following either sham operation (transection and reanastomosis) or 50% proximal small bowel resection (SBR). (B) Expression of Lgr5 mRNA in the ileal crypts of wild type and p21-null mice at 3 days following sham operation or SBR.
