We talked about the Pegasus anchestor thread about this. If every human had Ancients origin in the Pegasus galaxy as the second form the "normal" humans were never carried there, then technically everyone must have the ATA-gene. It also means if the Wraith has purely evolved from the Iratus bug then they won't have the ATA-genes, but I am guessing the Iratus evolution was accelerated when they managed to feed on an Ancient body. That would explain why they can drain or give back life force.
https://forum.gateworld.net/threads/...raith-Heritage
https://forum.gateworld.net/threads/...raith-Heritage
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