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> How T cells function when stimulated by infections:
> 
> https://medicalxpress.com/news/2020-09-memory-immune.html
> 
> "After an infection of the human body with a pathogen, a cascade of reactions will usually be set into motion. Amongst others, specific cells of the immune system known as T cells get activated in the lymph node and will subsequently divide and proliferate.
> 
> "At the same time, these cells will gain certain functions, that enable them to destroy other cells, that are e.g. infected by a virus. In addition, they produce certain proteins—so called cytokines—with which they can stop the reproduction of the pathogen.
> 
> ***
> 
> "If a body has fought and eliminated a pathogen successfully, most of the recently proliferated T cells are no longer needed and will die," Wolfgang Kastenmueller explains. But about five to ten percent of these cells survive and develop into a long lasting "memory population," that will protect the body against future infections.
> 
> "Kastenmueller describes the main result of his study, "In our recent work we identified a transcription factor—BATF3, that very specifically regulates the survival of these cells and therefore the transition into a memory response." The scientists could show that this factor only gets produced shortly after the initial activation of T cells. The absence of this factor leads to a permanent malfunction of the memory response.
> 
> "Until now the role of this factor for so-called CD8+ T cells was unclear. It was only after the scientists overexpressed this factor in CD8+ T cells that the importance became clear, as they could see that the survival of these cells and thus the immunological memory improved significantly."
> 
> Comment: A complex design that had to be designed at the start of multicellular life to protect that   new form of life.