1HHN:
reference: NMR structure of the calreticulin P-domain., Ellgaard L, Riek R, Herrmann T, Guntert P, Braun D, Helenius A, Wuthrich K, Proc Natl Acad Sci U S A 2001 Mar 13;98(6):3133-8. PMID: 11248044

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