><dd><p>3,774 x 16,791 sparse matrix of UMI counts, with
     rows corresponding to samples (cells) and columns corresponding to
     genes. It is an object of class <code>"dgCMatrix"</code>).</p></dd>

  <dt>samples</dt><dd><p>Data frame containing information about the
    samples, including cell barcode and source FACS population
    ("celltype" and "facs_subpop").</p></dd>

  <dt>genes</dt><dd><p>Data frame containing information and the genes,
    including gene symbol and Ensembl identifier.</p></dd>
