| 21. | Proline is often seen immediately following the end of ?-helices.
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| 22. | This enabled a method to be found of linking the two helices.
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| 23. | The secondary structure consists of alpha helices and beta sheets.
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| 24. | Domain 3 is made up of 7 ?-helices.
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| 25. | Some protozoan SRP RNAs have reduced helices 3 and 4.
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| 26. | The p11 monomer is an asymmetric protein composed of four alpha helices.
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| 27. | The sheet is surrounded by two alpha-helices on each side.
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| 28. | They speculated that the dimer may coordinate rearrangement of the transmembrane helices.
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| 29. | These ? helices form the wide, flat surface of the domain.
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| 30. | Below the gate, four helices form the exit channel.
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