Expression correlations between and within experiments. Frequency distribution of Pearson's intragene correlations for probesets expression profiles of Zhang et al.  and Su et al.  data. Correlations were calculated for olfactory epithelium, vomeronasal organ, lung, heart, testis, muscle and cerebellum. Dashed (blue) line with diamonds represents the correlation values between 216 OR genes in Zhang et al.  and Su et al.  data. Solid (pink) line with squares within 402 probesets pairs from Zhang et al. , each pair representing the same OR in the coding region and in the 3' UTR. Solid (green) line with triangles for a set of 1000 randomly selected gene pairs probesets from Su et al. . The first two lines were smoothed applying a moving average every 2 points. The first two correlation groups were not significantly different according to Wilcoxon test (p = 0.55), while these two differed from the third (Wilcoxon test, p < 0.0001).
Feldmesser et al. BMC Genomics 2006 7:121 doi:10.1186/1471-2164-7-121