Larger samples collected by volunteer-led projects, show the Albanians belong largely to Y-chromosomes J2b2-L283, R1b-Z2103/BY611 and EV-13 from Ancient Balkan populations. Ancient graves found in Croatia dating back to the Bronze Age were found to also belong to the Y-chromosomes J2b2-L283 and R1b-Z2103, the latter of which was assigned to Vučedol culture. The findings are believed possibly to be from Proto-Illyrian migrations to the Balkans. The findings further demonstrate that Indo-European migrations occurred to the Balkans already during the Bronze Age, with intermittent genetic contact with steppe populations occurring up to 2,000 years earlier than the migrations from the steppe that ultimately replaced much of the population of Northern Europe.