Ishikawa, Hisato, Hiroshi Kitoh, Fumiaki Sugiura, and Naoki Ishiguro. 2007. “The Effect of Recombinant Human Bone Morphogenetic Protein-2 on the Osteogenic Potential of Rat Mesenchymal Stem Cells After Several Passages”. Acta Orthopaedica 78 (2):285-92. https://doi.org/10.1080/17453670710013816.