2
Cool. It's just two letters, which determines if CTS5856 is positive or negative. (CTS5856 is the next downstream SNP below V13 that about 99% of V13's are also positive for).
If you're negative, like I suspect, Europa Nazione is right that you may be related to Vasojeviç E-V13, since one of them is tested as V13+ CTS5856-
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