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<p>is composed entirely of <a href="page.php?w=beta_sheet">?-sheets</a>, with the possible exception of a few isolated <a href="page.php?w=alpha_helix">?-helices</a> on the periphery.</p>

<p>Common examples include the <a href="page.php?w=SH3_domain">SH3 domain</a>, the <a href="page.php?w=beta-propeller_domain">beta-propeller domain</a>, the <a href="page.php?w=immunoglobulin_fold">immunoglobulin fold</a> and <a href="page.php?w=B3_DNA_binding_domain">B3 DNA binding domain</a>.</p>

<p><big> ?+? </big></p>
<p>?+? proteins are a class of <a href="page.php?w=structural_domain">structural domain</a>s</p><p>
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