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[QUOTE]Originally posted by capra: [QB] [QUOTE]Originally posted by Ish Gebor: [qb] So why did they change it into T1a, T1a-M70 and K2-M526? It's a serious question.[/qb][/QUOTE]Well Karafet changed K2 to T in 2008, and everyone went along with her, but she didn't explain why. I guess she just figured all the K names were getting confusing and we should use some of the leftover letters. When they found that some men had the M184 and L206 mutations but not the M70 mutation - previously all of these were considered equivalent markers for haplogroup T - that showed that M70 marked a subclade of T, so they renamed it T1-M70, a branch of T-M184. Later they found that some men had M184 but not L206, so they made a new level, T1-L206, and demoted M70 to T1a. (You can look at the ISOGG trees for previous years and see the changes from year to year.) When they found that L and T were on one branch of K (sharing the mutation P326) and that M, N, O, P, and S were on another (sharing M526), these branches were named K1 and K2. This is the main reason the nomenclature changes, they keep finding new levels of branching in the tree (this is why R1b1a changed to R1b1a2, they found the L754 level). Sometimes though people just propose changes because they think it's clearer, and it may catch on or it may not. There's no fixed standard that everyone adheres to, usually people go by ISOGG but there is also a different one introduced by Karmin et al that some people are using. This is why it is always good to include the mutation name, say K2-M70 instead of just K2, because if you say K2 what did you mean? And even using the latest terms when someone comes back and reads it again in five years it'll probably have changed again. [/QB][/QUOTE]
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