gene expression regulation transactivation YH, ZX WEB: http://en.wikipedia.org/wiki/Transactivation trans-activate, trans-activated, trans-activates, trans-activating, trans-activation, trans-activator, trans-activators, transactivate, transactivated, transactivates, transactivating, transactivation, transactivator, transactivators a gene expression regulation that leads to an increased rate of gene expression triggered either by biological processes or by artificial means.