Cluster analysis of expression profiles of altered expressed genes in the QS versus EG.A showed a cluster of ESTs that were down-regulated mainly at squaring stage (SF) when the tetrads were produced and the microsporocyte underwent meiosis. B showed ESTs that were down-regulated especially at full bloom stage (BF). C and D suggested a cluster of ESTs that were down-regulated and up-regulated constitutively during the four developmental stages respectively. The ratio value was log2 transformed for each gene and used for the hierarchical clustering analysis.
Qiu et al. BMC Genomics 2012 13:397 doi:10.1186/1471-2164-13-397