Changes

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

==Helper CD4+==

==Helper CD4⁺==

<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