6E8H:
reference: Identification and characterization of a large family of superbinding bacterial SH2 domains., Kaneko T, Stogios PJ, Ruan X, Voss C, Evdokimova E, Skarina T, Chung A, Liu X, Li L, Savchenko A, Ensminger AW, Li SS, Nat Commun. 2018 Oct 31;9(1):4549. doi: 10.1038/s41467-018-06943-2. PMID: 30382091

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