Inter-island exchange of haplotypes between the north of Ireland and northern Britain.

<p>The boxplots show the distribution of individuals on principal component (PC) 1 for each island and for specific sampling regions (Scotland/Northern Ireland) and cluster groups (SSC and NICS; see <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1007152#pgen.1007152.g002" target="_blank">Fig 2</a>). A substantial proportion of Northern Irish individuals fall within the expected range for Scottish individuals in PC space and <i>vice versa</i>. This exchange is particularly pronounced for Northern Irish and Scottish individuals that fall within the NICS and SSC cluster groups (<a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1007152#pgen.1007152.g002" target="_blank">Fig 2</a>), respectively.