Proliferating cell nuclear antigen expression in liver slides on postoperative day 3. Cells with brown nuclei were proliferating cell nuclear antigen (PCNA)-positive. Scale bar represents 20 μm. n = 6, *P <0.05 and **P <0.01. H-BMMSC, hypoxia-conditioned bone marrow mesenchymal stem cells; N-BMMSC, normoxia-conditioned bone marrow mesenchymal stem cells; VEGF, vascular endothelial growth factor.