Advances in genetic research have made it possible to analyze ancient DNA (aDNA). In June 2015, new results concluded that the remains are more closely related to modern Native Americans than to any other living population. Kennewick Man's genetic profile was particularly close to that of members of the Confederated Tribes of the Colville Reservation. Of the five tribes that originally claimed Kennewick Man as an ancestor, their members were the only ones to donate DNA samples for evaluation. The lack of genomes from North American aboriginal populations have made it impossible to ascertain Kennewick Man's nearest living relatives among regional Native American tribes. His Y-DNA haplogroup is Q-M3 and his mitochondrial DNA is X2a, both uniparental genetic markers found almost exclusively in Native Americans.