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Flexible on the outside: The functional structure of the transport protein in human blood, human serum albumin (HSA), was characterized by distance measurements with double electron–electron resonance (DEER) spectroscopy on spin-labeled fatty acids that are bound to HSA. The functional protein structure derived has a more rigid inner core, while the surface of the protein shows much greater structural flexibility.
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Junk et al. (2010) studied this question.
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