Specific Immune Responce

APC- Antigen presenting cell

• Macrophages that display ‘non-self’ peptides (foreign protein)
• Start as phagocyte that engulfs bacteria or virus
• Breaks it down and presents foreign antigen on cell membrane
• Bind with T-helper cells with complementary CD4 receptors
•  APC can also come from B-Cells by binding with a specific pathogen or from infected cells presenting antigens on cell surface

T-helper Cells

• Specific binding to ANTIGEN
• Using complementary CD4 protein
• On bonding…