1. Why can't antibodies enter virus infected cells. Why can't virus infected cells make their membrane permeable for antibodies. 2. Why doesn't the body create antibodies against self. What is the mechanism behind the body knowing which cells are self and non self. 3.How do memory cells increase the response second time. Do the antigens get bind to memory cells quicker and then the process activates faster. 4. How are white blood cells produced in lymph? Thank you!!