Figure 2.

MJ network of Y chromosomes from men with Uí Néill–derived surnames. The sample population (n=59) features the IMH as its modal haplotype, which is ancestral to a phylogenetically coherent cluster (blackened circles) that accounts for over half (52.5%) of the sample group. The cluster was taken to extend to all haplotypes that could be continuously traced to the ancestral IMH Y chromosome via a pathway of increasing frequency, a topology roughly in line with expectations under a Poisson-distributed mutational process.