Dendogram showing hierarchical cluster analysis of TM gene expression profiles of donors with POAG (P133, P99, P85), low-tension glaucoma (G123), or suspected glaucoma (G125, G131) and normal control subjects (N105, N100, N134, N138). The individual samples were clustered in branches of the dendogram based on overall similarity in patterns of gene expression. All POAG samples clustered together.