| Figure 1-28 |
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| Packing motifs of a helical structure | |
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| When two helices pack together, their side chains interdigitate. Because several interhelical crossing angles allow good interdigitation, a number of distinct arrangements of helical bundles are possible. The two examples illustrated here are (a) cytochrome b562 (PDB 256b) and (b) human growth hormone (PDB 3hhr). |