Some haploytpes can be seen more frequently in certain parts of the world. For example, people whose ancestors are from the western coast of Europe often share in common a small group of Y-Chromosome STR markers. The group of Y-Chromosome markers which are frequently found in western Europe is called the Atlantic Modal Haploytpe (AMH). The AMH is characterized by the following markers:

DYS19 = 14
DYS388 = 12
DYS390 = 24
DYS391 = 11
DYS392 = 13
DYS393 = 13

More information about AMH can be found in Wilson et. Al. Genetic Evidence for Different Male and Female Roles During Cultural Transition in the British Isles. PNAD April 24, 2001 vol. 98, no. 9 pgs. 5078-5083.  Click here to download and print a copy of the original article. 

The AMH is tied to the R1b haplogroup.