Here is the list of Testing companies and what Y STR they test for http://www.gendna.net/ydnacomp.htm These are test of marker that change very slow over time so they are good for generations. Both my cousin and me were tested for 67 marker at familytreeDNA. Each marker change about once in 500 generations so marker change are like a clock. There is 50%/50% chance this match will be less or more that 14 transmission events between the two males. MAtt amd I have 6 generations each to Josiah Briant b. 1754?, so we have 12 transmission events between us. As shown by this calculator. http://dna-project.clan-donald-usa.org/tmrca.htm this Calculator is free from Doug McDonald Both Matt and I use O'Brien project at familytreDNA http://www.familytreedna.com/public/obrien/ If you have been tested at famliytreeDNA you can go to your personal page and join this project today. You can give out your number. my is 57501 As of today a total of 50 Bryants have been tested at family tree DNA. As more people test your chance of finding new information goes up. For Y DNA testing to work you need a male that has direct male line to your ancestor. Here are some good example of what other families have done. http://www.harrisdna.org/results.html I think it is important to get the Y67 test so you have a good reference for the future. I had a match that was 35/37 and when we went to Y67 it was a 63/67 not worth the time we put in to it at Y37. It cost less to be in a project. WE need a bigger data base like one for Bryant's from certain area of the country. The only way to get there is for more BRYANTS TO GET TESTED. John Bryant #57501 at the O'Brien porject