4HVW:
reference: Atomic resolution structures of the c-Src SH3 domain in complex with two high-affinity peptides from classes I and II., Bacarizo J, Camara-Artigas A, Acta Crystallogr D Biol Crystallogr. 2013 May;69(Pt 5):756-66. doi:, 10.1107/S0907444913001522. Epub 2013 Apr 11. PMID: 23633584

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