injection of dna in columns marked sol ns and edl ns the muscles 10 in each group have been stimulated by the nerve not stimulated at all or stimulated directly 10 minutes before the dna injection the electrical stimulator used for the experiments was manufactured by fhc brunswick me 04011 both pulsar 6 bp and the pulsar 6 bp a s stimulators have been used the pulsar 6 bp a s delivers a maximal voltage is 150 v and a maximal current of 50 ma the maximal voltage that can be delivered requires a resistance between the electrodes of greater than 3000 ohms the stimulators have been operated at constant voltage mode because of the low resistance in the muscle the voltages have been lower as discussed in the examples below in all experiments the current has been maintained at 50 ma it will be appreciated by one skilled in the art that numerous other electrode configurations can be employed for example fig9 illustrates the results obtained using two different electrodes configuration the electrode shown in a was placed perpendicular to the muscle fibers it consisted of a silver wire with diameter d of 0 6 mm c this is the electrode which was used in all experiments except in b one electrode was placed on each side of the muscle a short segment in the middle third of the.