Boxplot of Top2b

Next a sanity check: create a boxplot of the expression level of Top2b to confirm the null mice have lower levels of Top2b expression.

Recall that you made a similar boxplot in Chapter 1 Exercise 4.

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Differential Expression Analysis with limma in R

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The ExpressionSet object eset with the doxorubicin data has been loaded in your workspace.

Find the row that contains the Top2b data by searching the feature data column "symbol" for "Top2b".
Create a boxplot using the formula syntax. The expression level should be to the left of the ~, and the genotype variable to the right.
Pass the feature data frame row to main to title the plot.

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# Find the row which contains Top2b expression data
top2b <- which(___(eset)[___] == "Top2b")

# Plot Top2b expression versus genotype
boxplot(___(eset)[top2b, ] ~ ___(eset)[___],
        main = ___(eset)[top2b, ])

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