This study doesn't list which branches of H, U, or X . However U5 is  
believed to represent the original population of Europe(Hunter/Gatherers) 
before the spread of agriculture in the Neolithic period from the 

Middle East and Anatolia(modern day Turkey) , it is also believed to be the 
oldest branch of U.  Haplogroup X especially X2  is now found throughout 
Europe  it's spread is believed to have occurred more than 

20,000 at the time of the Last Glacial Maximum(the ice age)  but it is now 
found  more commonly in the Middle East especially among the Israeli Druze 
community. X1 is rare in Europe. Haplogroup H is the 

most commonly found mtDNA in Western Europe and along with Y-DNA R1b could 
this sample possible be H1? 

This link discusses Portuguese samples from the Mesolithic Period 
10,000-5,000BC an H1 is possibly represented  but some question whether the 
samples were contaminated.

http://www.ancestraljourneys.org/mesolithicdna.shtml

A.Faria


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