A number of SNPs have been identified with seemingly the same coverage in the population as M201. Because M201 was identified first, it is the standard SNP test used when testing for G persons. In order to determine if one of these alternative SNPs represents a subclade of M201, the alternative SNPs must be tested in G persons who are negative for the known subclades of G. There are only a tiny number of persons in such a category, and only a tiny number of persons have been tested for G equivalent SNPs other than M201.