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Over 20% on average. Kajkavian means NW Croat.
I have almost nothing Germanic genetically and I am southern Croat. However I am 1/8 German and probably that's why I look like that (I wouldn't say Germanic as I don't look Danish or Norwegian).
Genetically I inherited way less from that side than I should (and my Germans were heavily Celtic admixed, with minor Slavic) but phenotypically pretty much since my mother looks like stereotypical German (Faelid), and I resemble her just in gracile version.
Recent ancestry often shows up more in phenotype than something ancient, even if it is small.
As for Balkans, there is some Germanic there but nothing significant. Balkan Slavs can be modeled perfectly as Slavic + Paleo Balkan + Roman Anatolian
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