Figure 1: Display of baseline gene expression (A) and size (B) of the Pitt (light gray boxes) and NMI (dark gray boxes) cells during propagation in vitro. There is a certain tendency for the Pittsburgh cells towards early chondrogenic differentiation but the levels are still 2 to 3 orders of magnitude lower than after induction of differentiation (see Figure 2). (* = significant, p<0.05, t-test if normality and equal variance tests are passed, if not, rank sum test was performed.) Bars = 500 μm.