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Analysis of permutated microarray data (data set #5) obtained from data set #4 with the two-cluster structure destroyed by permutation of the data. Left: Ward clustering of the data, indicated by the dendrogram above the matrixplot of the permutated microarray data of acute myeloid or lymphoblastic leukemia [15]. Observation of the dendrogram would suggest, as expected, a two-cluster structure. Right: U-matrix display of the data. A cluster structure was clearly absent.
