 However, Haplogroup O-P31 is generally found with high frequency only among certain populations, such as the Austroasiatic peoples of India, Bangladesh and Southeast Asia, the Nicobarese of the Nicobar Islands in the Indian Ocean, Koreans, and Japanese.Besides its widespread and patchy distribution, Haplogroup O1b-P31 is also notable for the fact that it can be divided into three major subclades that show almost completely disjunct distribution.One of these subclades, O1B1-K18 can be mainly divided into two subclades O1b1a1-PK4 (formerly O2a) and O1b1a2-PAGE59 (formerly O2*(xM95,M176)).