Basic components of the immune system part 24

Immune 1

 

The T cell receptor complex recognizes small peptides presented to it by the major histocompatibility complex class I and II and depends on the type of T cell. Helper T cells  (CD4) recognize class II antigens while suppressor cytotoxic  T cells (CD8) recognize class I antigens.Because of the rather low affinity of the reactions, recognition of processed antigen alone is not sufficient to activate T cells. Soluble interleukins are needed to complete the picture and are generated during the antigen processing.

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