<p>Y-axis indicates percent of labeled nuclei due to incorporation of bromodeoxyuridine into DNA. The scale of Y-axis is kept identical to that of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0095487#pone-0095487-g004" target="_blank">figure 4</a>, for direct comparison of the responses of mouse and rat hepatocytes. The growth factors added to the medium are listed under the X-axis. CTR: Control cultures, with no growth factors added. Growth factors were added at 24 hours after plating of hepatocytes. D 0–2 (etc.) indicates days in culture after addition of the growth factors. (For growth factor concentration, please see Materials and Methods).</p
