The most important demographic influence in the modern Portuguese seems to be the oldest one; current interpretation of Y-chromosome and mtDNA data suggests that the Portuguese have their origin in Paleolithic peoples that began arriving to the European continent around 45,000 years ago. All subsequent migrations did leave an impact, genetically and culturally, but the main population source of the Portuguese is still Paleolithic. Genetic studies show Portuguese populations not to be significantly different from other European populations. Portuguese people have a preponderancy of genetics (Iron Age Period) which belong to R1b haplogroup family along with Brythonic, Alpine and Goidelic genetical markers. Also expectable but not so common are South European (Sardinian, Italian and Balkans), broadly North-western (West Germanic) and to a lesser extent British/Irish (Brythonic/Gaelic) and French (Alpine). With a low confidence range there are Scandinavian and East European genetical markers. Other sources would point out a small presence of Berber and Jewish that would be also part of a low confidence region.