 Y2a predominates in the Southeast Asian range of haplogroup Y, which is centered on the Philippines and Sumatra.However, Y2b has been observed in Japan and in a Buryat, and Y2* has been observed in Chinese, Japanese, and Khamnigan samples.This phylogenetic tree of haplogroup Y subclades is based on the paper by Mannis van Oven and Manfred Kayser "Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation" and subsequent published research.