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The latter question can be explored using Principal Components Analysis (PCA), an excellent method for reducing and visualizing high-dimensional data.

• Select Plot PCA Scatter Plot from the QA/AC section of the Gene Expression workflow 

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The next step is to draw a histogram to examine the samples.

• Select Plot Select Sample Histogram in the QA/QC section of the Gene Expression workflow to generate the Histogram tab (Figure 6)
  
  

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