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Cover picture: A class I major histocompatibility complex tetramer as it might appear from the surface of a T cell. The model is based on the
known structures of HLA-B8, shown in darker blues, and streptavidin, shown in light blue. Three class I molecules are clearly able to contact the
surface with the fourth molecule in a less accessible position. See related article in this issue by McMichael and O'Callaghan, pp. 1367-1371.
[Table of Contents]
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