<unk> s <unk>  are lymphocytes found in the epithelial layer of mammalian mucosal linings, such as the gastrointestinal (GI) tract and reproductive tract. Epithelium of small intestine contains approximately 1<unk>  per 10 enterocytes. However, unlike other T cells,<unk> s do not need priming. Upon encountering antigens, they immediately release cytokines and cause killing of infected target cells. In the GI tract, they are components of gut-associated lymphoid tissue (GALT). Based on expression of either an αβ T-cell receptor (TCR) or a γδ TCR<unk>  T cells can be divided into two major groups. In mice both groups are retained in almost equal proportions. In humans, the majority of<unk> s are alpha beta T cells. 15% of<unk> s are gamma delta T cells and thus represent a minor component of human<unk> s. However,<unk> s significantly increase under certain conditions, such as celiac disease.primary biliary cirrhosis. Bile duct<unk> s
Intraepithelial lymphocyte
Tingible body macrophage
Tumor-infiltrating lymphocytes
Lutzner cells
Lipid-laden alveolar macrophage
Touton giant cell
Langhans giant cell
Hypersegmented neutrophil