. "\"Any process that activates, maintains or increases the frequency, rate or extent of axon extension involved in axon guidance.\" [GOC:devbiol]" . . "positive regulation of axon extension involved in axon guidance" . "up regulation of axon extension involved in axon guidance" . "up-regulation of axon extension involved in axon guidance" . "upregulation of axon extension involved in axon guidance" . . . . "activation of axon extension involved in axon guidance" . "stimulation of axon extension involved in axon guidance" .