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Principal component analysis (PCA) of 47 neuroblastoma samples by log2-transformed normalized intensity of core probesets. PCA was performed using NI values of core probesets (n = 221,809) across all samples after quality filtering. Stage 1- and 4+ samples are clearly separated from each other, while stage 4- samples are located between them. Blue, stage 1-; green, stage 4-; red, stage 4+ tumors.
