U.S. Postal Inspectors are law enforcement agents, much like police officers and detectives, who maintain the integrity of the U.S. postal system. To become a postal inspector you must be able to fulfill certain duties and meet specific requirements.
epithelial cell, any one of several cells arranged in one or more layers that form part of a covering or lining of a body surface.The cells usually adhere to one other along their edges and surfaces. One surface is free, and the other rests on a noncellular basement membrane.See also epithelial tissue.ny of the cells forming the cellular sheets that cover surfaces, both inside and outside the body. Epithelial cells are closely packed and take on polyhedral shapes, from tall (columnar) through squat (cuboidal) to flat (squamous).
Intestinal epithelial cells are the cell boundary between the external environment and tissues of the gastrointestinal tract. From this interface the epithelial cells have evolved processes that help guide whether inflammation or an immune response will occur in the intestines.ntigen presentation by intestinal epithelial cells most commonly results in the inhibition of activation of T lymphocytes, including CD8+ T lymphocytes. Keywords: intestinal epithelium; cytokine; chemokine; antigen presentation; CD1. Figure 1. Architecture of the intestinal epithelium.