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*'''Thymus dependent areas''' - describes areas in lymphatic organs that are dominated by a collection of T-cells. T-cells have receptors that allow for the migration into these areas
 
*'''Thymus dependent areas''' - describes areas in lymphatic organs that are dominated by a collection of T-cells. T-cells have receptors that allow for the migration into these areas
 
*'''TNF receptor family''' - group of receptors structurally similar to TNF receptor
 
*'''TNF receptor family''' - group of receptors structurally similar to TNF receptor
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*'''Tolerogen''' - operational term: a substance that produces tolerance, ususally immunological
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*'''Toll-like receptors (TLR)''' - an example of PRR (pattern recognition receptors) they have a similar structure and result in a similar signal transduction cascade occuring
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*'''Transferrin''' - serum protein involved in iron transport
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*'''Transforming growth factor beta (TGF-beta)''' cytokine with antiinflammatory and immunosupressing properties
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*'''Transgenic animal''' - a foreign gene is coloned into an animal such that it is constitutively expressed, usually in a mouse
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*'''Transgenic knock out animal''' - the inactivation of a functioning own gene through the insertion of a foreign gene into the functioning gene, this is usually done in mice
 
*'''Transplacental''' - Scientific term for passing through the placenta crossing the physical and biological barriers
 
*'''Transplacental''' - Scientific term for passing through the placenta crossing the physical and biological barriers
 
*'''Transport host''' - loose association in which the parasite is carried by the host
 
*'''Transport host''' - loose association in which the parasite is carried by the host
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