I have added a tree showing the snps for P37+ sector of haplogroup I and found from Chromo2 tests, “Chromo2P37”. I don’t expect it to be 100 percent clean of errors, this is time consuming, eye challenging stuff. Many of the S series snps showing phyloequivalent to M423 also have a CTS name and have been split in the last month by the 8000 year old bones found in Luxuemberg and Sweden, and which today probably represent an extinct branch of the haplogroup I tree. Kenneth Nordtvedt Haplogroup I Clade Modalities and Trees at: http://knordtvedt.home.bresnan.net