Figure 1.

Expression profiles of human ribosomal protein (RP) genes in 30 tissues. (A) Hierarchical clustering of tissue expression profile using a centroid linkage algorithm. Black regions represent low gene expression level for that gene (row) in the tissue (column), whereas the red regions represent high gene expression level. The genes in the Main cluster, Sub-cluster 1, and Sub-cluster 2 show a correlation coefficient value of 0.94, 0.98 and 0.75, respectively.(B) Detection of differentially expressed RP genes by Grubbs' outlier test. Red regions represent genes (row) expressed at significantly higher rates in a certain tissue (column) than any other RP gene. Blue regions represent genes expressed at significantly lower rates than any other RP gene. A P value <0.05 was considered significant.