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Figure 4.
Fig. 4. Protein ligands for class I molecules interact
with different surfaces. Superposition of class I/receptor
complexes for which the structure is known reveals that the five
class I ligand types bind at distinct locations. Class I
interaction surfaces are colored according to each ligand: US2
(magenta), Ly49A (green), B7 TCR (blue), KIR2DL1 (red), CD8  (cyan).
Equivalent C atoms for
class I heavy chain were used to generate pairwise
superpositions. HLA-A2 heavy chain (yellow),  [2]-microglobulin
(gray), US2 (magenta), Tax peptide (green).
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