sentences:  However, the development of new drugs was greatly facilitated.Infected human red blood cells are incubated in a culture dish or flask at 37 °C together with a nutrient medium and plasma, serum or serum substitutes.A special feature of the incubation is the special gas mixture filled with Nitrogen (90-92 %) CO2 (5 %) and Oxygen (3-5 %) allowing the parasites to grow at 37 °C in a cell incubator.