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<p>typically high in <a href="page.php?w=alanine">alanine</a>, <a href="page.php?w=leucine">leucine</a>, <a href="page.php?w=arginine">arginine</a>, and <a href="page.php?w=cysteine">cysteine</a>, that forms a right-handed <a href="page.php?w=Alpha_helix">?-helix</a>.  Two of these polypeptide chains twist together to form a left-handed <a href="page.php?w=Alpha_helix">helical</a> structure known as a <a href="page.php?w=coiled_coil">coiled coil</a>.  These coiled coil <a href="page.php?w=Dimer_%28chemistry%29">dimers</a>, approximately 45&nbsp;nm</p><p>
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