Images
Figure 1. Structure of BTB ligand (6)

Figure 2. Interactions between J22.9-xi chimeric antibody and BCMA residues (1)
Key: Residues are colored based on biochemical properties (red, negatively charged; blue, positively charged; purple, aromatic hydrophobic; green, polar; grey, hydrophobic; orange, proline). 
Dashed lines connecting residues denote direct contact, with dash width being proportional to the surface area of the interaction. Orange dashed lines signify hydrophobic contacts; dashed lines with a blue stripe signify hydrogen bonds. Superscripts indicate the CDR region (1-3) of the residue (1).