Figure 2.
Reproducibility of the genes identified by the microarray technology. (a) Reproducibility of the data obtained from the GeneChip array study. The green dots represent the genes detected in both P1 samples, an estimated 34% of the genes on a single chip. The yellow or blue dots represent the genes detected only in one of the samples, and thus these signals only constitute about 0.25–0.3% of the genes on the chip. (b) Differential gene expression between P1 and P30. An intensity of 400 to 500 corresponds to approximately one copy per cell. The axes represent gene expression intensity. The green dots represent the genes detected in both P1 and P30. The yellow dots represent the genes detected in P1, but not P30. Similarly, the blue dots represent the genes detected in the P30 sample, but not in P1. Five percent of probe sets showed more than 3-fold changes.