by Kathleen Abadie, Elisa Clark and Hao Yuan Kueh,The Conversation Graphical abstract. Credit: Immunity (2024). DOI: 10.1016/j.immuni.2023.12.006How does your immune system decide between fighting invading pathogens now or preparing to fight them in the future? Turns out, it can change its mind. Every person has 10 million to 100 million unique T cells that have...