Pathogen containing non-self antigen enters body, Antigen presenting cell with complementary antibody embedded in cell membrane binds to non-self antigen, Antigen presenting cell engulfs pathogen, Antigen presenting cell digests pathogen into fragments, Antigen presenting cell displays fragments of pathogen on membrane as an antigen, Antigen presenting cell exposes helper T cell to antigen, Exposure to antigen activates/sensitises helper T cell, Activated hHelper T cell enlarges and divides into clone cells, Clone cells develop into either helper T cells, cytotoxic T cells, memory T cells or supressor T cells, When the pathogen has been destroyed, supressor T cells decrease activity of T and B lymphocytes.

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