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JC Polyoma virus capsid protein complexed with sialyl-lactose, molecular model. The image shows the pentameric major capsid protein VP1 in a ribbon representation. The complexed 6'-sialyl-lactose is shown spacefilled (the larger three of the smaller molecules), as are the residual 1,2-ethanediol molecules (the smaller ones). (KEYSTONE/SCIENCE PHOTO LIBRARY/LAGUNA DESIGN/SCIENCE PHOTO LIBRARY)