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Structure comparison and the peptide-binding model. Stereoview of structural superposition of hOSF-SH3 (black) with c-Crk-SH3 (red; PDB code 1cka) in complex with the proline-rich peptide PPPALPPKK (green). Residues involved in peptide binding are shown as stick models and the rest as Cα traces. The peptide is also shown with stick models. For clarity, only the termini and the key residues of hOSF-SH3 are labeled.
