Hierarchical clustering of HV genes-regulated by frankincense and sandalwood essential oils in bladder cancer J82 cells. (A) Temporal expression profiles of genes that were commonly regulated by both frankincense and sandalwood essential oils. (B) Genes that were identified to be specifically regulated by frankincense essential oil. (C) Genes that were identified to be specifically regulated by sandalwood essential oil. Each column represents time intervals following essential oils exposure; and each row represents a gene probe. Expression levels for individual genes were scaled by green or red color indicating an elevated or suppressed level of expression, respectively.