The Category Variable field is used to specify a character variable containing annotation categories. This variable is often obtained from an ontology hierarchy like the Gene Ontology (GO) or from lists of pathways. Multiple categories within a value must be separated by one or two common delimiters, as specified on the General tab. If a row has a blank value for this variable, then that row is excluded from the analysis.All of the variables in the specified annotation data set are displayed in the Available Variables field.
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Clickto add the highlighted variable to the Category Variable field, as shown below: