Ethidium bromide-stained agarose gel showing host-specific cytochrome b polymerase chain reaction products amplified from whole blood DNA extractions and engorged female An. sinensis in the field. Control products amplified from whole blood are shown in lane 1 (calf, 561 bp), lane 2 (pig, 453 bp), lane 3 (goat, 132 bp), lane 4 (dog, 680 bp), and lane 5 (human, 334 bp), respectively. Engorged female An. sinensis in three villages in Yongcheng city are shown in lane 6-22, respectively. Lane 23, negative control. Outside lanes are 100 bp DNA ladders. bp = basepairs.