Figure 2.

Proliferation curves of bone marrow (BM)–mesenchymal stem cell (MSC) and moderate or severely affected chondrocytes. BM-derived MSCs or chondrocytes derived from cartilage moderately or severely affected with osteoarthritis were cultured as described in the Materials and Methods section. The cell concentration and viability were determined at various time points during the culture. The results from 3 individual subjects (mean and standard deviation) are shown to illustrate the individual variability in the rate of cell proliferation.