Eleftheria Kodosaki, Cardiff Metropolitan University
We know that the body's immune system is important for keeping everything in check and protecting us. But a lot of us don't realise that the brain also has an immune system.
Microglia, which are the brain's immune system cells, are involved in everything - from brain development to protecting against diseases such as meningitis and Alzheimer's. But for all the good these cells do for us, under the wrong conditions they can also cause us harm.
Microglia belong to a group of non-neuronal cells called glia, which originally were thought to play a supportive role for the brain's neurons.
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