Selif Xam was a Polis Massan physician who lived and worked in an archaeological research station on Polis Massa. During the Clone Wars, Xam was part of a team investigating ancient ruins on the asteroids formed during the destruction of the original Polis Masa planet. When Padmé Amidala was near death and brought into the facility, it was Xam who led the medical team to deliver her unborn children. Despite possessing limited knowledge of Human birth, Xam reprogrammed his medical droids to assist him in the delivery. Although Padmé could not be saved, they did succeed in saving her twins, Luke and Leia.