. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of the proliferation of neuroblasts.\" [GOC:ai]" . . "negative regulation of neuroblast proliferation" . "down regulation of neuroblast proliferation" . "down-regulation of neuroblast proliferation" . "downregulation of neuroblast proliferation" . "suppression of neuroblast proliferation" . . . "inhibition of neuroblast proliferation" .