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IGB allows you to work with numerical/graph data, allowing you to do quantitative comparisons between data sets. This is especially useful for comparing experimental results between a control and treatment group, for instance. You may need to compare the relative differences in expression levels, or you may need to generate an average. For example, a graph of cancerous cells will show what's turned on or off when compared to a graph of normal cells. Results that show significantly more or less activity than a control graph for the same region may indicate an area of interest. While you can use the Combine Annotations functions to qualitatively locate regions of interest, combining graphs will give you quantitative answers.
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