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The Celts grew out of Bell Beaker. Not really related to Meds. Mediterranean populations like the Greeks and Romans saw the Celts as foreign to them. Urnfield and Unetice are thought to be pre-Celtic. Even today most Irish are still very similar to old Unetice samples.
Bell Beaker is a Yamnaya off shoot and brought R1b-L21 to Britain and Ireland with a nearly complete population replacement in the Bronze Age.
Latest study on the topic. Just adding the title because it should clue people in on what happened.
The Beaker Phenomenon And The Genomic Transformation Of Northwest Europe
http://www.biorxiv.org/content/biorx...35962.full.pdf
Here Eurogenes blog on the topic of the Rathlin genomes.
http://eurogenes.blogspot.com.au/201...-point-to.html
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