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chap·er·o·nin | \ ˌsha-pə-ˈrō-nən 
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\Medical Definition of chaperonin
: any of a group of ATP-dependent protein chaperones consisting of two rings of radially arranged subunits
One class of chaperone molecules, called chaperonins, performs the important task of shepherding newly made proteins away from each other and helping them fold into the correct shape.— Evelyn Strauss, Science News, 6 Sept. 1997
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