. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of microtubule polymerization.\" [GOC:mah]" . . "negative regulation of microtubule polymerization" . "down regulation of microtubule polymerization" . "down-regulation of microtubule polymerization" . "downregulation of microtubule polymerization" . . . . "inhibition of microtubule polymerization" .