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I184 lipophilic contact between protomers. This illustration was generated from PDB entry 4TVP, the X-ray structure of SOSIP BG505 (29). The dot mesh shading represents the solvent-accessible surfaces (SAS) (the van der Waals surfaces expanded by the water molecule radius) of the two residues from adjacent protomers (73, 74). Where the SAS overlap, the two residues exclude solvent access to each other.
