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Distribution of the top 20 most-differentially expressed genes. (A-D) The top 20 differentially expressed genes overlayed on the PCA plot: 5 of the genes were associated with cluster 1 (A); 5 genes were associated with cluster 2 (B); 4 genes were associated with both clusters 1 and 2 (C); and 6 genes were associated with cluster 3 (D).
