Spontaneous discharges and evoked tonic discharges in small-sized DRG neurons in MRMT-1-rats. (A): Representative of spontaneous discharges. (B): Representative of evoked discharges. The red trace represents the discharges recorded from representative small DRG neurons in MRMT-1-implanted rats. Note that implantation of MRMT-1 tumor cells into the tibial canal in rats provoked spontaneous discharges and evoked tonic discharges in MRMT-1-rats but not control rats.