A gaming system for conducting a wagering game includes a wager input device, a display for displaying a randomly selected outcome of a wagering game, and a controller operatively coupled to the display and the wager input device to operate in a plurality of selectable game modes of which a selected one is a current game mode. For obtaining the amastigote forms, this medium is buffered at a pH of 5. The first direction generally runs approximately medially-laterally.