A model of the Fn9-10–α5β1 complex. The no. 10 molecule from the mouse Fn9-10 fragment nuclear magnetic resonance structures (Protein Data Bank accession no. 2MFN) docked onto the α5β1 using the bound RGD peptide (green stick model) as a guide is shown as a magenta ribbon model, with the Arg1379 side chain highlighted. Carbohydrate moieties are shown by modeling GlcNAc₂Man₅ residues (space-filling model) at the tip of Asn residues. α5 and β1 chains are surface rendered in wheat and gray, respectively, except for the three acidic residues (red) and MIDAS Mg²⁺ (blue). The trenchlike exposed surface is marked by black dotted lines.