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11 bytes added ,  13:02, 11 May 2012
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TCRs are linked to the cell membrane; structurally, they look like a single arm of an antibody molecule consisting of a distal domain and a membrane proximal constant domain
 
TCRs are linked to the cell membrane; structurally, they look like a single arm of an antibody molecule consisting of a distal domain and a membrane proximal constant domain
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==Helper CD4+==
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==Helper CD4<sup>+</sup>==
 
<p>These T cells express the marker CD4 and are categorised into two groups, Th1 and Th2, which are distinguished by the cytokines they produce. T helper cells recognise antigens bound to MHC II complexes.
 
<p>These T cells express the marker CD4 and are categorised into two groups, Th1 and Th2, which are distinguished by the cytokines they produce. T helper cells recognise antigens bound to MHC II complexes.
 
*Th1 cells produce Il-2, IFN-γ and TNF-α  
 
*Th1 cells produce Il-2, IFN-γ and TNF-α  
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