R1b1a1 Haplogroup Project
A phylogenetic analysis of the R1b1b Project participants' haplotypes reveals three distinct clusters. The clusters are distinct enough that I am identifying them as nesting subclades. In other words, the third cluster is a subclade of the second. And the second cluster, in turn, is a subclade of the first.
Here is a NeighborNet network of the participants, which illustrates the clustering.
Click here to view the network.