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Detail of the Abl SH3 domain bound to the Crk SH2 domain (residues 68–75) in the ternary complex (two orientations rotated 90° toward the viewer). Side chains of residues identified to make contacts to Crk SH2 domain are highlighted. D71 of Abl may participate in an ionic interaction with R68 of Crk. Secondary structure elements are labeled above the sequence, following the standard nomenclature for SH3 domains.
