Figure 3. In MSC undergoing osteoblast differentiation, TSP2 deficiency does not affect the amount of type I collagen present in conditioned medium.
A: After 4 days in osteoblastic culture, collagen gene expression levels, normalized to actin, were determined by rtPCR. B: Collagen protein levels in cell-conditioned medium were determined by Western blot (top panel). Band intensities were determined using histograms generated in ImageJ (bottom panel). Bars are mean and SD of data obtained from 2 independent cell harvests totaling 6 wells per genotype.