Figure 4

Comparison of the results of microarray and Northern blot analyses. Data were obtained from a time-course experiment for cold treatment of rice seedlings [15]. a. In the microarray analysis, intensity data were normalized by means of the three-parameter lognormal distribution model, and transformed to ratio-basis in comparison with control plants. The number of data points was 33, and the correlation coefficient was r= 0.8579. b. The same data set as in a., but the background of microarray data was subtracted using local background method [13] and then the data were normalized by globalization. The correlation coefficient was 0.7613. c. The same as b., but normalized using LOWESS method [3]. The correlation coefficient was 0.7845.