Figure 1

Normalization plot of microarray data Normalization plot from a representative analysis of changes in gene expression between day 13 (proliferative, y axis) and days 21–23 (secretory, x axis) endometrium. The blue line is the diagonal y = x, the red circles are the probes selected in the "invariant set" and the green curve indicates the running median normalization curve based on the "invariant set".