Fig. 4

The pathological pictures as the mouse was subjected to electrical treatment three times after 72 h. a The picture for the case of most of the tumor cells was died. b The picture for the case of most of the tumor cells were apoptosis after electrical treatment based on liquid metal spray-printed electrodes. c The picture for the case of normal muscle tissues beside the tumor. d The enlarged picture where the tumor cells were apoptosis. e The enlarged picture of the tumor cells being died. f The section picture of tissue without tumor cells