Table 5.

Variation of the correlation in the measurements performed with 1 μg and 10 μg RNA

Centile	Met A 1 × Met A 10	Met B 1 × Met B 10	MTR A 1 × MTR A 10	MTR B 1 × MTR B 10
0-20	0.589	0.589	0.563	0.668
20-40	0.132	0.248	0.103	0.422
40-60	0.018	0.087	-0.022	0.332
60-80	0.191	0.179	0.120	0.350
80-100	0.698	0.763	0.706	0.807

The results for experiments with 1 or 10 μg RNA were compared after ordering the genes with the corresponding hybridization values in increasing order. A high correlation indicates that the results are very similar for both conditions. The correlation is very good for highly expressed or poorly expressed genes whereas it is low for those with medium expression. Met, methionine; MTR, methylthioribose; A and B refer to different days, and 1 and 10 refer to the amount of RNA (see text).