Lower termites of the genus
Scharf et al. used cDNA macroarrays to compare gene expression between polyphenic castes and intermediary developmental stages in the termite
"Since our experiments examined a non-differentiated caste (worker) and a developmental end point (soldier), many key developmental genes were certainly not identified. If there is a master gene that regulates caste out there in termites, it likely awaits discovery," conclude the authors.