The Clan Mulvihill DNA Project focuses on the the unique fingerprint displayed on the Y-Chromosome by all males and defines their male-male lineage over thousands of years. This feature parallels the use of surnames in the western world and gives us the ability to explore ancestry back in time before the existence of paper records. See also www.mulvihill.net/genealogy This is a volunteer organization, Administrators receive no compensation or incentives from Family Tree DNA.