Haplogroups, Mitochondrial Haplogroups, Haplogroup U and K Origins and History, The K Project

Haplogroups
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K originated around 14,000 years ago, most likely in Greece.  
The mutation from K1a1b to K1a1b1 occurred about 14,218 years ago, then mutated to K1a1b1a about 4,823 years ago. (According to the academic paper by Behar 2012.)