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, Helper T cell produces cytokines, Cytokines activate/sensitise B lymphocytes, Activated B lymphocytes grow and divide into clone cells, Clone cells develop into either plasma cells or memory cells, Plasma cells produce antibodies, memory cells are stored in lymph tissue to fight future infections.

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