What cells lack MHC class I proteins? What is the function of MHC class I proteins? How do proteins become associated with MHC class I molecules? What are sources of foreign proteins associated with...

What cells lack MHC class I proteins? What is the function of MHC class I proteins? How do proteins become associated with MHC class I molecules? What are sources of foreign proteins associated with MHC class I molecules? What happens to cells presenting

foreign antigens? What is the structure of MHC class II molecules? Describe the structure of the α and β chains.