Thymocytes that are not selected during Positive Selection: Group of answer choices are eliminated because of their reactivity with foreign antigens are most of the developing thymocytes and die by apoptosis in the thymic cortex are exported to the periphery, where they are phagocytosed by macrophages undergo genetic reprogramming and differentiate into a different cell type try out different beta-chains to acquire reactivity with self-MHC molecules