<span class="SFPTagline"> From SCIFIPEDIA </span>

The Ancient Life-Signs detector is a technological device designed by the Ancients. The device requires the ATA gene in order to activated. Its basic function is defined by its name. While one cannot tell the exact location or identity of a life sign, it greatly increases the ability of the Atlantis Expedition teams to carry out their missions. It was first used by then Major John Sheppard (" Rising, Part 2") to locate Colonel Marshall Sumner, and the others taken by the Wraith.