Figure 2
From: Structural Basis for Human PECAM-1-Mediated Trans-homophilic Cell Adhesion

Interfaces of IgL1-2 dimerization.
(A) Residues that participate in homophilic interaction are plotted and displayed in 2D with DIMPLOT of the LigPlot plus suite35. Protein side chains primarily involved in hydrophilic interaction are shown as ball-and-stick. Red, blue, black balls represent oxygen, nitrogen and carbon atoms respectively. Green dotted lines labeled with distances indicate hydrogen bonds. Non-bonded residues contributing to hydrophobic interactions are shown as spoked arcs. Oxford-blue dotted lines embrace residues located at the same IgL domains. Interface2 (in between IgL2-B and IgL1-A) and Interface1 (in between IgL1-B and IgL2-A) correspond to (B) and (C) revealing 3D representation of hydrogen bonds processed by Chimera. Chain A and B are colored in corn flower blue and hot pink respectively. O (red) and N (blue) atoms that contribute to hydrogen bonds are linked by dotted lines (dark blue) with distance labels.