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Gene expression during the yeast cell cycle. In this figure genes correspond to the rows, and the time points of each experiment are the columns. The ratio of induction/repression is shown for each gene such that the magnitude is indicated by the intensity of the colors displayed. If the color is black then the ratio of control to experimental cDNA is equal to 1, while the brightest colors (red and green) represent a ratio of 2.8 to 1. Ratios greater than 2.8 are displayed as the brightest color. In all cases red indicates an increase in mRNA abundance while green indicates a decrease in abundance. Gray areas (when visible) indicate absent data, or data of low quality. Colored bars on the side of the figure indicate the phase group to which a gene belongs (M/G1, yellow; G1, green; S, purple; G2, red; M, orange). These same colors indicate cell cycle phase along the top of the figure. (A) Gene expression patterns for the 800 cell cycle regulated genes. The expression patterns of the 800 cell cycle regulated yeast genes that we identified are graphically displayed. The genes are ordered by the times at which they reach peak expression. The colored bars on the top of the figure indicate progression through the cell cycle while the colored bars on the side of the figure show the limits of each of the five categories. There are 300 genes expressed during G1, 71 genes expressed during S, 121 genes expressed during G2, 195 genes expressed during M, and 113 genes expressed during M/G1.
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