I transferred my Y-STRs to FamilyTreeDNA, why did some of my marker values change?
FamilyTreeDNA and Sorenson Labs use different standards to report four STR (short tandem repeat) marker values. After you transfer your results, we convert them to FamilyTreeDNA's standard. The four markers that will change are DYS441, DYS442, Y-GATA-A10, and Y-GATA-H4.