5CPV:
reference: Restrained least squares refinement of native (calcium) and cadmium-substituted carp parvalbumin using X-ray crystallographic data at 1.6-A resolution., Swain AL, Kretsinger RH, Amma EL, J Biol Chem 1989 Oct 5;264(28):16620-8. PMID: 2777802

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