And the best picture is--the HIV gp120 envelope, please!
Berger
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D015704:CD4 Antigens / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004252:DNA Mutational Analysis; D015699:HIV Envelope Protein gp120 / Q000737:chemistry* / Q000235:genetics; D007157:Immunologic Surveillance; D008958:Models, Molecular; D011485:Protein Binding; D011487:Protein Conformation; D019707:Receptors, Chemokine / Q000737:chemistry*
D015704:CD4 Antigens; D015699:HIV Envelope Protein gp120; D019707:Receptors, Chemokine