FIG. 2.

Identification of patterns of gene expression following growth stimulation and during the mammalian cell cycle. Expression profile of individual genes in the serum stimulation and HU release experiments, clustered according to the methods described in the text. The expression level of each gene in the two experiments was displayed by a pseudo-color visualization matrix (6). In each experiment, a vertical column represents all of the clustered genes for a given time point. The intensity of expression, as determined from the average difference values calculated by GeneChip expression analysis (Affymetrix), is depicted by the intensity of red color.