English Chemotaxis Cited by user DJ Jolt Maze on 26 Jun 2019 Positive chemotaxis occurs if the movement is toward a higher concentration of the chemical in question; negative chemotaxis if the movement is in the opposite direction.
English Response regulator Cited by user Opabinia regalis on 29 Feb 2016 A response regulator is a protein that mediates a cell's response to changes in its environment as part of a two-component regulatory system.