Species 149

From Memory Alpha, the free Star Trek reference.

Species 149 is the Borg designation for a medically advanced species.

The Borg assimilated from this species a technology that enabled them to reactivate drones as long as 73 hours after conventional definitions of death. The procedure involves using nanoprobes to reverse cellular necrosis while stimulating the cerebral cortex with neuroelectric isopulses. (VOY: "Mortal Coil")