Fig. 3

Somatosensory evoked potential (SEP) results showing functional improvements in rabbits with spinal cord injury following transplantation of human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) compared with rabbits subjected to PBS treatment. The best recovery of electrophysiological responses was observed in the rabbits that received repeated injections with 3-day intervals (3RI). a Mean SEP waveforms recorded at baseline, before the first transplantation and 8 weeks after the first transplantation from Cz–Fz during hindlimb stimulation in four groups. b Onset latency results at scheduled times in the four groups. c Peak-to-peak amplitude results at scheduled times in the four groups (**p < 0.01, ***p < 0.001 and ****p < 0.0001, respectively). SI, single injection; 7RI, repeated injections at 7-day intervals