In 2014, there was a major change in the definition of subclade N1, when LLY22g was retired as the main defining SNP for N1 because of reports of LLY22g's unreliability. According to ISOGG, LLY22g is problematic because it is a "palindromic marker and can easily be misinterpreted." Since then, the name N1 has been applied to a clade marked by a great number of SNPs, including CTS11499, Z4762, and CTS3750. N1 is the most recent common ancestor of all extant members of Haplogroup N-M231 except members of the rare N2-Y6503 (N2-B482) subclade. The TMRCA of N1 is estimated to be 18,000 years before present (16,300–19,700 BP; 95% CI).