yytz: Please do post the source when you find it.
I specifically did not include the Levite DNA as it is a distinct anomaly – and I have yet to find a source that explains it clearly. Truly weird that most Jews and Kohanim share DNA traits but half of Ashkenazi Levites do not. I have also wondered why in most shuls there are many more Kohanim than Leviim (at least in my experience). My shul in Monsey had a congregation of about 1/3 Kohanim (including the Rav) and not many Leviim at all.