The jejunum is the midsection of the small intestine, connecting the duodenum to the ileum. It is about 2.5 m long, and contains the plicae circulares, and villi that increase its surface area. Products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here.
Not to be confused with the cells of the islets of Langerhans, found in the pancreas, or Langhans giant cell.
The special feature reviews further highlight the challenges and controversies faced by the Langerhans cell community as they continue their research into these important immune cells. Image courtesy of Kristian Pfaller and Patrizia Stoitzner, Innsbruck Medical University, Innsbruck, Austria.