| 1. | Four keratin helices twist around one another to form a protofibril.
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| 2. | Arrows represent ?-strands and circles represent ?-helices.
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| 3. | The ?-sheet is flanked by 10 ?-helices.
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| 4. | It consists of a distorted jellyroll structure and two short helices.
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| 5. | Type V appears to have a total of 12 transmembrane helices.
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| 6. | The PEDF structure includes 3 beta sheets and 10 alpha helices.
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| 7. | The KilA-N domain has been suggested to be helices.
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| 8. | There are no beta-sheets present, just alpha helices.
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| 9. | The periplasmic domain consists of two helices, TM2 and TM8.
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| 10. | Long homopolymers of amino acids often form helices if soluble.
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