Rhinovirus 3C Protease: Protein Data Bank
Matthews, D., et al. Structure-Assisted Design of Mechanism-Based Irreversible Inhibitors of Human Rhinovirus 3C Protease with Potent Antiviral Activity Against Multiple Rhinovirus Serotypes Proc.Nat.Acad.Sci.USA 96 pp. 11000 (1999)

Sonic Hedgehog: Protein Data Bank
Hall, T. M., Porter, J. A., Beachy, P. A., Leahy, D. J.: A potential catalytic site revealed by the 1.7-A crystal structure of the amino-terminal signalling domain of Sonic hedgehog. Nature 378 pp. 212 (1995)

Superoxide Dismutase: Protein Data Bank
Hough, M. A., Hasnain, S. S. Crystallographic structures of bovine copper-zinc superoxide dismutase reveal asymmetry in two subunits: functionally important three and five coordinate copper sites captured in the same crystal. J Mol Biol 287 pp. 579 (1999)

Beta Globin: Protein Data Bank
Miyazaki, G., Morimoto, H., Yun, K. M., Park, S. Y., Nakagawa, A., Minagawa, H., Shibayama, N. Magnesium(II) and Zinc(II)-Protoporphyrin Ix'S Stabilize the Lowest Oxygen Affinity State of Human Hemoglobin Even More Strongly Than Deoxyheme J.Mol.Biol. 292 pp. 1121 (1999)

SRY: Biomolecules Gallery

Rhodopsin: ???
Sorry, I've lost the source for this one. If you recognize this image, and can provide the source for it, please let me know.

Aequorin: Protein Data Bank
Head, J. F., Inouye, S., Teranishi, K., Shimomura, O. The Crystal Structure of Photoprotein Aequorin at 2.3 A Resolution Nature 405 pp. 372 (2000)

Prion: Protein NMR Structure Gallery, Rutgers University
R. Riek, S. Hornemann, G. Wider, M. Billeter, R. Glockshuber, K. Wuthrich. NMR Structure of the Mouse Prion Protein Domain PrP (121-231). Nature 382:180 (1996)

Nonconformer prion folding pattern:
Cohen, Prion Picture Gallery, University of California at San Francisco

Calmodulin: Protein Data Bank
Chattopadhyaya, R., Meador, W. E., Means, A. R., Quiocho, F. A. Calmodulin structure refined at 1.7 A resolution. J Mol Biol 228 pp. 1177 (1992)

Lens Gamma Crystallin: SwissProt 3-D Images
White H.E., Driessen H.P.C., Slingsby C., Moss D.S., Lindley P.F.
Packing interactions in the eye-lens. Structural analysis, internal symmetry and lattice interactions of bovine gamma IVa-crystallin.
J. Mol. Biol. 207:217-235(1989).

Alcohol Dehydrogenase: Protein Data Bank
Colonna-Cesari, F., Perahia, D., Karplus, M., Eklund, H., Branden, C. I., Tapia, O. Interdomain motion in liver alcohol dehydrogenase. Structural and energetic analysis of the hinge bending mode. J Biol Chem 261 pp. 15273 (1986)

Triose Phosphate Isomerase: Protein Data Bank
Artymiuk, P. J., Taylor, W. R., Phillips, D. C. Triose Phosphate Isomerase. To be Published