Duodenum length (A), dry mucosal mass (B), and concentrations of mucosal protein (C) and DNA (D) in rats subjected to distal small bowel resection (60% jejunoileal resection + cecectomy) and maintained with TPN plus GLP-2 infusion. The oral group includes nonsurgical reference animals fed ad libitum. Values are means + SE. a,b,c,d Means with different superscripts are significantly different (P < 0.05).