The tumor-targeting ability of ZHPV16 E7 affitoxin384. The xenograft-bearing mice were generated with cell lines of (A) SiHa, (C) CaSki, (E) HeLa, and (G) A375, respectively. NIR imaging was performed at different time points post injection with DyLight-755-labeled ZHPV16 E7 affitoxin384. DyLight-755-labeled ZHPV16 E7 384 and Zwt affitoxin were used as positive and negative controls, respectively. The tumor/muscle ratios were calculated at 8 h post-injection of indicated agents in xenograft-bearing mice generated with cell lines of (B) SiHa, (D) CaSki, (F) HeLa, and (H) A375, respectively. Data are given as mean ± SD (n=5). **P <0.01 versus the control group.