types in mesolithic central European sites. The existence of an especially strong genetic association between the Irish and the Basques was first challenged in 2005, and in 2007 scientists began looking at the possibility of a more recent Mesolithic- or even Neolithic-era entrance of R1b into Europe. A new study published in 2010 by Balaresque et al. implies either a Mesolithic- or Neolithic- (not Paleolithic-) era entrance of R1b into Europe. Unlike previous studies, large sections of autosomal DNA were analyzed in addition to paternal Y-DNA markers. They detected an autosomal component present in modern Europeans which was not present in Neolithic or Mesolithic Europeans, and which would have been introduced into Europe with paternal lineages R1b and R1a, as well as the Indo-European languages. This genetic component, labelled as "Yamnaya" in the studies, then mixed to varying degrees with earlier Mesolithic hunter-gatherer and/or Neolithic farmer populations already existing in western Europe. A more recent whole genome analysis of Neolithic and Bronze Age skeletal remains from Ireland suggested that the original Neolithic farming population was most similar to present-day Sardinians, while the three Bronze Age remains had a large genetic component from the Pontic-Caspian Steppe. Modern Irish are the population most genetically similar to the Bronze Age remains, followed by Scottish and Welsh, and share more DNA with the three Bronze Age men from Rathlin Island than with the earlier Ballynahatty Neolithic woman. A 2017 genetic study done on the Irish shows that there is fine-scale population structure between different regional populations of the island, with the largest difference between native 'Gaelic' Irish populations and those of Ulster Protestants known to have recent, partial British ancestry. They were also found to have most similarity to two main ancestral sources: a 'French' component (mostly northwestern French) which reached highest levels in the Irish and other Celtic populations (Welsh, Highland Scots and Cornish) and showing a possible link to the Bretons; and a 'West Norwegian' component related to the Viking era. As of 2016, 10,100 Irish nationals of African descent referred to themselves as "Black Irish" in the national census. The term "Black Irish" is sometimes used outside Ireland to refer to Irish people with black hair and dark eyes. One theory is that they are descendants of Spanish traders or of the few sailors of the Spanish Armada who were shipwrecked on Ireland's west coast, but there is little evidence for