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70 chaperone system consists of Hsp70, Hsp40, and a nucleotide exchange factor (Hsp70 has an ATPase activity). Although the ATP-bound form of Hsp70 has a low affinity for substrates due to its high substrate exchange rate, the ADP-bound form has a higher affinity for substrates with a low substrate exchange rate. Hsp40 acts as a co-chaperone and activates the Hsp70 ATPase, although it also acts as

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