2J6K:
reference: Atypical polyproline recognition by the CMS N-terminal Src homology 3 domain., Moncalian G, Cardenes N, Deribe YL, Spinola-Amilibia M, Dikic I, Bravo J, J Biol Chem. 2006 Dec 15;281(50):38845-53. Epub 2006 Oct 3. PMID: 17020880

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