"They have investigated the brains of ageing mice, elucidating the source of the cGAS–STING trigger and the particular cells in which this pathway is activated (Fig. 1). Specifically, the authors find that cytosolic DNA derived from perturbed mitochondria activates the pathway in ageing microglia, the main immune cells in the brain — an observation that agrees with earlier findings that cGAS–STING is involved in activating microglia and in neuroinflammation"
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