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Hierarchical clustering of four breast cancer datasets by FOTS/EF core gene sets. Within the heatmap, red represents higher expression levels, green represents lower expression levels, and black represents mean expression levels. Sample clusters designated with Orange and Blue trees are FOTS + breast cancers and EF + breast cancers in GSE1456 (A), GSE3494 (B), GSE4922 (C) and NKI dataset (D).
