Figure 4From: Examining smoking-induced differential gene expression changes in buccal mucosa Replicate Samples a and b Raw Signal Value Histograms. Two arrays, NS21a and Sm27a have low overall signal strength as shown by the intensity plot. The arrays from the matching b cheek NS21b and Sm27b show acceptable values. Note the difference in y-axis density scale. NS nonsmoker, Sm smoker.Back to article page