Figure 1.

Experimental design. For a particular cell line, the material was divided into six batches; two batches of non-amplified RNA were directly labeled (white shapes) and four batches of diluted total RNA were amplified before labeling (grey shapes). These batches were split in two and labeled Cy5 (red) or Cy3 (green). In total, four array experiments were based on non-amplified material, and eight experiments were based on amplified material.