I'm sometimes amazed by the very "unside" position of some forumers - old tribes did not change language and culture as we change skirt today but some mergins between two different populations had underwent progressive language change according to economic and politic power of one of the antagonists - crossings occurred and not only by the mating of foreign women - I' have not every SNPs distrivution by ancient ethnic groups and even in modern populations - I put my brain at work and I see a very sensible possibility of Y-I2a1(b) occupying central Europe for a long time (Paleolithic): surely enough between Moravia ha Carpathians, Balkans - the farming cultures send by Near-eastern and anatolian peoples were surely adopted by some Y-I2a of Balkans-Carpathians and we have seen great civilisations, advances and powerful enough, growing between E-Balkans and Ukraina at Eneolithic and then Bronze Age (Bulgaria, Romania, Tripolje and extensions: so what is so surprising that a predominently population of Y-I2a1(b) mixed with steppic Y-R1a bearers??? What is so surprising? according to the regions, the density of Y-I2 could have varied? I believe proto-Slavs developped around Ukraina, in contact with Baltic People, (and others after) and that they absorbed a lot of Y-I2a, even if Y-R1a was still the predominent HG - these I2a1 knew maybe a baby boom during their eneolithical period, encreasing in number but not in within diversity - when Slavs, lately enough (historical times) invaded the Balkans, they send "their" Y-I2a1 thay mixed with ancient cousins stayed there since the preneolithicial times (these last ones was numerous enough but too more variated??? How to be too affirmative?