. "Any process that stops, prevents, or reduces the frequency, rate or extent of the directed movement of a motile cell or organism in response to a specific chemical concentration gradient." . . . . . "negative regulation of chemotaxis" . "down regulation of chemotaxis" . "down-regulation of chemotaxis" . "downregulation of chemotaxis" . "inhibition of chemotaxis" . . . . . . . . . . . .