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<div style="padding:40px;color:#cbccc6"><h1>DNA 双螺旋 (B 型)</h1><p>B-form 右手螺旋，AT/GC 配对桥连。</p><div style="padding:20px;background:#0d1017;border-left:3px solid #ffb454"><span class="katex-display"><span class="katex"><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.1968em;vertical-align:-0.25em;"></span><span class="mord text"><span class="mord">2 strands, 10.5 bp/turn, 3.4 </span><span class="mord accent"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.9468em;"><span style="top:-3em;"><span class="pstrut" style="height:3em;"></span><span class="mord">A</span></span><span style="top:-3.2523em;"><span class="pstrut" style="height:3em;"></span><span class="accent-body" style="left:-0.375em;"><span class="mord">˚</span></span></span></span></span></span></span><span class="mord"> rise</span></span></span></span></span></span></div><p style="color:#707a8c">该页面需要 JavaScript 进行交互式可视化。</p></div>
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