Figure 2

Correspondence of expression level between microarrays and MPSS. Pearson correlation was used as a measure of correspondence of expression levels reported by each microarray platform versus each MPSS library. For microarray data, normalized and filtered intensities were used. With the tag count threshold being varied from 1 to 100 tpm for MPSS in steps of 1, Pearson correlations were calculated for the genes with tag counts above each given threshold. Part (a) shows how the correlations from these comparisons varied with threshold on data for MRP1, and part (b) shows the same for MRP2.