Table 4.

Characteristic values for the distribution of intensities (arbitrary units) in different experimental conditions

	Met A 1	MTR A 1	Met B 1	MTR B 1	Met A 10	MTR A 10	Met B 10	MTR B 10
First	406	381	300	293	523	548	532	488
quartile
Second	597	559	434	422	762	833	797	756
quartile
Third	970	913	719	693	1,230	1,371	1,335	1,294
quartile

The genes were ranked according to the intensity of the corresponding hybridization; the values were then arranged into four sets of equal numbers, with increasing hybridization values. The value for the highest hybridization in each quartile is given here. Met, methionine; MTR, methylthioribose; A and B refer to different days, and 1 and 10 refer to the amount of RNA (see text).