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Heat map of merged gene expression data of the nine selected genes across 47 Strategic Partnering to Evaluate Cancer Signatures (SPECS) estrogen receptor–positive (ER+) samples (indicated by green in the top image bar) and the 1508 ER+ Molecular Taxonomy of Breast Cancer International Consortium (METABRIC) samples (indicated by black in the top image bar) before (left panel) and after (right panel) data transformation (as described in Materials and Methods).
