. "Any process that activates or increases the frequency, rate or extent of actin polymerization." . . . . "positive regulation of actin polymerization and/or depolymerization" . "positive regulation of actin filament polymerization" . "activation of actin filament polymerization" . "positive regulation of actin polymerization" . "stimulation of actin filament polymerization" . "up regulation of actin filament polymerization" . "up-regulation of actin filament polymerization" . "upregulation of actin filament polymerization" . . . . .