I found this good reference I am sharing http://dgmweb.net/genealogy/DNA/DNA-Introduction.shtml John Bryant R1b1c* http://www.familytreedna.com/public/r1b/ Irish Type III http://au.geocities.com/t120r61/Irish_Type_III.htm #57501 at O’Brien project http://www.familytreedna.com/public/obrien/ Josiah Bryant Cooperative Research Group http://freepages.genealogy.rootsweb.com/~ourbryants/index.htm