Clustering of ESTs found to be differentially expressed during fat cell differentiation. Shown is k-means clustering of 780 ESTs found to be more than twofold upregulated or downregulated at a minimum of four time points during fat cell differentiation. ESTs were grouped into 12 clusters with distinct expression profiles. Relative expression levels (log2 ratios) for EST gene at different time points are shown and color coded according to the legend at the top (left) and expression profile (mean ± standard deviation) for each cluster (right). EST, expressed sequence tag.