mtDNA Haplogroup U defining mutations
This list was compiled by Ron Scott but has not been updated since October 2011. It is retained for reference. For an up-to-date list of mtDNA mutations please refer to the mtDNA tree on Phylotree.

Ron Scott's Phylogenetic trees
These trees are no longer being maintained but are retained for historical reference:
Ron Scott's phylogenetic tree for U4a (not updated since 2011)
Ron Scott's phylogenetic tree for U4b (not updated since 2011)
Ron Scott's phylogenetic tree for U4c (not updated since 2011)
Ron Scott's phylogenetic tree for U4d (not updated since 2011)