Figure 4 reports the expression scatter plots of the two markers with the strongest overexpression in cancer (alpha-methylacyl-CoA racemase/AMACR [44] and CLDN3 [43]) and in normal (FLNC [42] and keratin 5/KRT5 [45]) tissue and KLK3/PSA for comparison. The gene discussed is KRT5; the disease is cancer.