Fig. 4. In the absence of its antidote Kis, toxin Kid kills human cells. (A) Plot showing that only 9 out of 154 HeLa cells (5.8%) survived 24 h after Kid microinjection, whereas 155 out of 168 HeLa cells (92.5%) did so after Kid plus MBPKis microinjection. (B) Plot showing that only 9 out of 72 SW480 cells (12.5%) survived 48 h after Kid microinjection, whilst 65 out of 65 (100%) of these cells did so when they were microinjected with Kid plus MBPKis.