The Prototype Immunoglobulin Molecule Fab Heavy Chains(five VH types:a,y,u,8,s) Light Chains (two CH1 types:7 and Fab fragment 42 Fc fragment Fc Constant and CH3 variable regions Carbohydrate Disulfide linkages The Prototype Immunoglobulin Molecule Fab Fc VH CH1 CH2 CH3 VL CL ◼ Heavy Chains (five types:     ) ◼ Light Chains (two types:  and  ) ◼ Fab fragment ◼ Fc fragment ◼ Constant and variable regions ◼ Carbohydrate ◼ Disulfide linkages