Profile: Family Tree DNA provides testing service for genealogists. We offer Y-DNA37, which is a male specific test. Results identify the ethnic and geographic origin of the paternal line. It includes a balanced panel of thirty-seven Y-chromosome short tandem repeat, STR, markers. This is the recommended test to trace the paternal ancestry of males for genealogy purposes. The additional markers refine the predicted time period in which two individuals are related and eliminate unrelated matches. A perfect match at thirty-seven markers indicates that the two individuals share common ancestry in recent times. Y-DNA12 is a male specific test. It is used to affirm or disprove a genealogical connection on the direct paternal line.