Figure 2.

Classification of the 54,675 probe sets within the Affymetrix U133Plus2 microarray. The composition of probe sets with respect to probe categories is depicted. The height of each bar represents the number of probe sets (Y-axis) that contain a least one probe in the indicated category (X-axis). The gray segment of each bar represents the number of probe sets where less than six probes of the indicated category are present. The black segment comprising each bar represents the number of probe sets where more than six probes of the indicated category are present.