an class="n">values</span><span class="o">/</span><span class="n">genes</span> <span class="n">you</span> <span class="n">want</span> <span class="n">to</span> <span class="n">label</span> <span class="n">on</span> <span class="n">the</span> <span class="n">volcano</span>
<span class="n">values_colours</span><span class="o">=</span><span class="p">{}</span> <span class="o">--&gt;</span> <span class="n">a</span> <span class="n">dictionary</span> <span class="n">of</span> <span class="n">colours</span> <span 