an class="kw">function</span><span class="op">(</span><span class="va">x</span><span class="op">)</span> <span class="op">{</span><span class="fu"><a href="https://rdrr.io/r/base/unique.html" class="external-link">unique</a></span><span class="op">(</span><span class="va">infos</span><span class="op">[</span><span class="va">infos</span><span class="op">$</span><span class="va">affy_hg_u133_plus_2</span><span class="op">==</span><span class="va">x</span>,<span class="st">"hgnc_symbol"</span><span class="op"