Editing Celts (section)

===Genetic evidence===
{{See also|Corded Ware culture#Genetic studies}}
Arnaiz-Villena et al. (2017) demonstrated that Celtic-related populations of the European Atlantic (Orkney Islands, Scottish, Irish, British, Bretons, Basques, Galicians) shared a common [[HLA system]].{{clarify|date=January 2022}}<ref>International Journal of Modern Anthropology Int. J. Mod. Anthrop. (2017) 10: 50–72 HLA Genes in Atlantic Celtic populations: Are Celts Iberians? Available online at: www.ata.org.tn</ref>

Other genetic research does not support the notion of a significant genetic link between these populations, beyond the fact that they are all West Europeans. [[Early European Farmers]] did settle Britain (and all of Northern Europe) in the [[Neolithic]]; however, recent genetics research has found that, between 2400 and 2000 BC, over 90% of British DNA was overturned by [[Western Steppe Herders|European Steppe Herders]] in a migration that brought large amounts of Steppe DNA (including the [[Haplogroup R-L21|R1b haplogroup]]) to western Europe.<ref name="Olalde et al.">{{cite bioRxiv |last1=Olalde |first1=I |display-authors=et. al |date=May 2017 |title=The Beaker Phenomenon and the Genomic Transformation of Northwest Europe |biorxiv=10.1101/135962}}</ref> Modern autosomal genetic clustering is testament to this fact, as both modern and Iron Age British and Irish samples cluster genetically very closely with other North Europeans, and less so with Galicians, Basques or those from the south of France.<ref>{{Citation |last1=Novembre |first1=J |last2=Johnson |first2=T |last3=Bryc |first3=K |title=Genes mirror geography within Europe |journal=Nature |volume=456 |issue=7218 |pages=98–101 |date=November 2008 |pmid=18758442 |doi=10.1038/nature07331 |pmc=2735096 |bibcode=2008Natur.456...98N |display-authors=1 |last4=Kutalik |last5=Boyko |first5=AR |last6=Auton |first6=A |last7=Indap |first7=A |last8=King |first8=KS |last9=Bergmann |first9=S |last10=Nelson |first10=MR |last11=Stephens |first11=M |last12=Bustamante |first12=CD}}</ref><ref>{{Citation |vauthors=Lao O, Lu TT, Nothnagel M |title=Correlation between genetic and geographic structure in Europe |journal=Curr. Biol. |volume=18 |issue=16 |pages=1241–48 |date=August 2008 |pmid=18691889 |doi=10.1016/j.cub.2008.07.049 |s2cid=16945780 |display-authors=etal |doi-access=free |bibcode=2008CBio...18.1241L}}</ref>