The immune system is fast when it comes to fighting viruses, bacteria and other pathogens. But it also has to know when not to attack - for example, harmless substances such as pollen or house dust, which otherwise trigger allergic reactions.
Reviewed by Danielle Ellis, B.Sc.Oct 30 2023 Regulatory T cells in the lymph nodes play a key role here, suppressing excessive or misdirected immune responses there.
Tregs store information about past immune responses This observation was made possible by a technique called "photoconversion". It allows cells to be marked by light - with a special torch, as it were - and their changes in position to be observed over longer periods of time.
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