The gene expression of normal breast, duct carcinoma in situ, breast cancer cell lines and breast cancer tissues is clustered by principal components analysis. A total of 2,575 highly expressed SAGE (serial analysis of gene expression) tags were identified after filtering of the original 88,178 unique tags expressed and broken down into the eleven principal components of clustered genes, which were labeled after visual interpretation. Brackets indicate the invasion-specific cluster and the normal epithelium cluster, which are expanded in size on the right for easy viewing. False colors are applied in a continuous scale according to the normalized tag counts. Sample identities are aligned with respective columns using a visual guide at top left. For details, see the article by Iacobuzio-Donahue et al. on page 5351 of this issue.

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