. "\"Any process that activates or increases the rate of neuroblast proliferation.\" [GOC:dph]" . . "positive regulation of neuroblast proliferation" . "up regulation of neuroblast proliferation" . "up-regulation of neuroblast proliferation" . "upregulation of neuroblast proliferation" . . . "activation of neuroblast proliferation" . "stimulation of neuroblast proliferation" .