Thank you Debbie.
Interestingly, my branch is coded BY... even I testes Y-700 directly. Maybe because I split from a Y-500 tester?
"Y-SNPs discovered from the Big Y-500 will have the prefix BY followed by a number, e.g., BY147, BY592.Y-SNPs discovered from the Big Y-700 will have the prefix FT (or FTA, FTB, FTC, FTD, etc.) followed by a number, e.g., FT385, FT62."