Haplogroup P1, also known as P-M45 and K2b2a, is a Y-chromosome DNA haplogroup in human genetics. Defined by the SNPs M45 and PF5962, P1 is a primary branch (subclade) of P (P-P295; K2b2).
^ abcTumonggor, Karafet et al., 2014, "Isolation, contact and social behavior shaped genetic diversity in West Timor", Journal of Human Genetics Vol. 59, No. 9 (September), pp. 494–503.
^ abcE. Heyer et al., 2013, "Genetic Diversity of Four Filipino Negrito Populations from Luzon: Comparison of Male and Female Effective Population Sizes and Differential Integration of Immigrants into Aeta and Agta Communities", Human Biology, Vol. 85, Iss. 1, p. 201.
^Gregory R Magoon; et al. (2013-11-22). "Generation of high-resolution a priori Y-chromosome phylogenies using "next-generation" sequencing data". bioRxiv10.1101/000802.