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. Author manuscript; available in PMC: 2012 Jan 21.
Published in final edited form as: Osteoarthritis Cartilage. 2007 Oct 10;16(4):489–497. doi: 10.1016/j.joca.2007.07.015

Figure 6.

Figure 6

Projection plot of gene behavior represented by the first three principal components. The genes readily separated into 2 clusters which correspond to genes that respond positively to IL-1β and TNF-α treatment (triangles = Group 2 of Table 1) and those genes that either did not respond or responded negatively to the cytokine treatment (squares; Group 1). The black circles indicate the group centroids which are significantly different from each other (p<0.001; Student’s t-Test).