1SJI:
reference: Comparing skeletal and cardiac calsequestrin structures and their calcium binding: a proposed mechanism for coupled calcium binding and protein polymerization., Park H, Park IY, Kim E, Youn B, Fields K, Dunker AK, Kang C, J Biol Chem 2004 Apr 23;279(17):18026-33. Epub 2004 Feb 10. PMID: 14871888

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