Lysosomes, with their arsenal of catabolic enzymes and crucial metabolic housekeeping functions are experiencing a revived research interest after having lived a rather quiet life for the last few decades. With the discovery of the interaction of the lysosomes with another ancient component of cellular homoeostasis, the molecular chaperone HSP70 (heat-shock protein 70), the stage seems set for further discoveries of the mechanisms regulating cellular and physiological stress responses to otherwise detrimental challenges.

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