A bacterial toxin protein such as a Shiga toxin protein is efficiently produced using plant cells. Each of pair of legs has a lower end that is attached to and extends upwardly from the rear edge. Multiple secondary servo burst sets are written at the desired track pitch but radially offset from the primary burst set. A dispenser assembly opens and closes the discharge openings and the released water and liquid concentrate directly leaves the mixing chamber to produce the beverage. An optical density of the ND filter decreases in a direction radially outwards from a center of the ND filter.