A new system for gene electrotransfer. Photograph of the electroporator EP-GMS 7.1 (a), photograph of the electrodes E-S 4.1 (b) and electrodes E-S 4.1 geometry design (c). Electrodes are numbered. Their diameter is 3.5 mm. Electrodes 1 and 2 or 3 and 4 are opposite electrodes and are 5 mm apart. Adjacent electrodes are 2.5 mm apart, which is a half distance between opposite electrodes.