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Comparison of the 35–48 β-hairpin structure of CD4 with the corresponding 16–27 β-hairpin of CD4M3. Note the good superposition of CD4 backbone structure (green) with that of CD4M3 (magenta) and the similar conformation of the CD4 side chains Gln-40, Phe-43, and Thr-45 (blue) with the corresponding side-chains of CD4M3 (red).
