pan><span class="n">join</span><span class="p">(</span><span class="n">gene_list</span><span class="p">)</span>
    <span class="n">description</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span>
    <span class="n">payload</span> <span class="o">=</span> <span class="p">{</span>
        <span class="s1">&#39;list&#39;</span><span class="p">:</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">genes_str</span><span class="p">),</span>
        <s