This is an old post in 2007 shortly after the list began by David Wilson explaining in part how he analyses M222 samples. "The sure test for R1b1c7 membership is a finding of derived (= positive) status on the Single Nucleotide Polymorphism called M222. This SNP is one of the SNPs tested by FTDNA in their DeepSNP testing option. If you want to be sure, you should order that test. But in the absence of a SNP test, you can get an indication from the values for specific markers in your haplotype. If you go to www.ftdna.com/public/R1b1c7 you will see a list of STR values that are characteristic of R1b1c7 haplotypes. Not all R1b1c7 haplotypes will have all of those values, but any R1b1c7 haplotype will have most of those values. If you are looking for a fast evaluation based on just the first 12 markers, the shorthand indicator is this: If you have 390=25, 385b=13 and 392=14, you are almost certainly R1b1c7. If you have any two of those values, you are very likely to be R1b1c7. If you do NOT have at least two of those values, you are very likely NOT to be R1b1c7. If you don't have any of those values, you are not R1b1c7." He repeats the same info on the M222 site at FTDNA. "The R-M222 project is open to all individuals who have a derived (i.e., positive)test result on the M222 SNP. The project also welcomes individuals who have not been SNP tested, but whose haplotypes show most of the following values: DYS390= 25 DYS385b = 13 DYS392 = 14 DYS448 = 18 DYS449 = 30 DYS464 = 15-16-16-17 DSY456 = 17 DYS607 = 16 DYS413 = 21-23 DYS534 = 16 DYS481 = 25 (FTDNAconvention; = 24 EthnoAncestry convention)* DYS714 = 24 " "In most cases the first three STRs in the list above are adequate to establish membership in this group. If you have at least two of those three values and differ by only one at the mismatching marker, you are very probably (though not certainly) a member of the R-M222 haplogroup. If you are uncertain about whether you belong to Haplogroup R-M222, please contact the project administrator and co-administrator for advice." John