3I9Q:
reference: The effect of a proline residue on the rate of growth and the space group of alpha-spectrin SH3-domain crystals., Camara-Artigas A, Andujar-Sanchez M, Ortiz-Salmeron E, Cuadri C, Casares S, Acta Crystallogr D Biol Crystallogr. 2009 Dec;65(Pt 12):1247-52. Epub 2009, Nov 17. PMID: 19966410

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