Development of resistance to artemisinin, its five potent derivatives, and standard antibiotics in ATCC 43504 (A) and clinical isolate 80A (B). The results for artemisinin (⎔), GRB-1 (○), GRB-2 (■), GRB-3 (◆), GRB-4 (▲), GRB-5 (△), CLR (●), AMX (□), and MNZ (♢) are presented.