Epithelial cells are arranged in tightly packed layers that line the surfaces and cavities of tissues and organs throughout the body. It covers rang skins, respiratory tracts( nasal cavity and lungs ), alimentary tracts(oral cavity, stomach, intestines ), urogenital tract (kidney, vesicae, uterus and epididymis ), from all anacrine glnads (pancreas, gallbladder, mammary gland, salivary glands, lacrimal gland, sweat gland and etc. ), even some immune system organ (like thymus gland ).

The

Epithelial cells are arranged in tightly packed layers that line the surfaces and cavities of tissues and organs throughout the body. It covers rang skins, respiratory tracts( nasal cavity and lungs ), alimentary tracts(oral cavity, stomach, intestines ), urogenital tract (kidney, vesicae, uterus and epididymis ), from all anacrine glnads (pancreas, gallbladder, mammary gland, salivary glands, lacrimal gland, sweat gland and etc. ), even some immune system organ (like thymus gland ).

The

The colorectum is a major organ for both malignant and nonmalignant diseases. Cells that line the colonic mucosal surface form a major mechanical barrier that separates the host's internal milieu from the external environment. In addition to the well-established role of epithelial cells in ion transport, these cells appear to function as an integral component of the mucosal immune system. Human colon epithelial cells can process and present antigens to T cells in vitro, and can be stimulated to

The colorectum is a major organ for both malignant and nonmalignant diseases. Cells that line the colonic mucosal surface form a major mechanical barrier that separates the host's internal milieu from the external environment. In addition to the well-established role of epithelial cells in ion transport, these cells appear to function as an integral component of the mucosal immune system. Human colon epithelial cells can process and present antigens to T cells in vitro, and can be stimulated to