DNA analysis of Dir clan members inhabiting Djibouti found that all of the individuals belonged to the Y-DNA T1 paternal haplogroup. All genetic analysis carried out on Gadabuursi male clan members have so far shown that they exclusively belong to the T1 paternal haplogroup. A notable member of the T1 haplogroup is also the third US President, Thomas Jefferson. The Gadabursi clan according to many sources are divided into 2 divisions, the Habar Makadur and Habar 'Affan. The Habar Makadur and Habar 'Affan, both historically united under a common Sultan or Ughaz. The following listing is taken from the World Bank's "Conflict in Somalia: Drivers and Dynamics" from 2005 and the United Kingdom's Home Office publication, "Somalia Assessment 2001".