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Serbs and Croats do not have Germanic origins. 40 or so percent of Croats and 35-45% of Serbs are haplogroup I-M423, the Balkans haplogroup I. Some studies onSerbs even show frequencies as high as 50%. These men are indigenous to the Balkans and have been in that area for thousands of years. I personally call them "southern proto-Europeans". They share a same haplogroup but different subclade as their Scandinavian I cousins that dominate Sweden and Norway (northern proto-Europeans). Croats have slightly higher Slavic R1a blood, 30-38% or so versus Serbia's 15-20% of men. Serbia has significantly higher north-African blood ( Balkans haplogroup E found in Greece, Albania, Bulgaria, Macedonia, is also found in Serbs at about 20-25% of Serbian males.) overall, I-M423 and R1a dominate most Croatian men and I-M423 with almost exact levels of R1a and E ( slightly more E than R1a ) dominates Serbian men. "Germanic" blood is very low in both these countries with haplogroup R1b around 10- max 15% in both countries and haplogroup I1a ( I don't even refer to this as Germanic I just call it Nordic or Nordic haplogroup I) being low in both countries. They are both predominantly Southern proto European (balkanian I) and Slavic, although Serbia has more haplogroup E presence and maybe 10% more I-M423 whereas Croatia has maybe 10% more R1a.