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. Author manuscript; available in PMC: 2008 Jun 22.
Published in final edited form as: Am J Obstet Gynecol. 2006 Aug;195(2):373–388. doi: 10.1016/j.ajog.2006.07.001

Figure 6.

Figure 6

Hierarchical clustering using one-channel microarrays data. This figure combines a “heat map,” which is the part of the figure containing colors (red, green, and black), with two dendrograms. Dendrograms are the tree-like structures displayed above and to the left of the heat map. The rows represent genes identified by the numbers on the right of the figure. The individual patient samples are shown as columns (1 column per sample). The color represents the expression level of the gene. Red represents high expression, while green represents low expression. The expression levels are continuously mapped on the color scale provided at the top of the figure. The dendrograms provide some qualitative means of assessing the similarity between genes and between patient samples. Note that the columns contain samples from two types of patients, A and B. Type A may represent samples from normal women and type B from women with pre-eclampsia. All women with the same diagnosis are grouped (clustered) together. This analysis was performed with the TM4 software suite (http://www.tm4.org).