Population Differentiation of Southern Indian Male Lineages Correlates with Agricultural Expansions Predating the Caste System ArunKumar, GaneshPrasad ; Soria-Hernanz, David F. ; Kavitha, Valampuri John ; Arun, Varatharajan Santhakumari ; Syama, Adhikarla ; Ashokan, Kumaran Samy ; Gandhirajan, Kavandanpatti Thangaraj ; Vijayakumar, Koothapuli ; Narayanan, Muthuswamy ; Jayalakshmi, Mariakuttikan ; Ziegle, Janet S. ; Royyuru, Ajay K. ; Parida, Laxmi ; Wells, R. Spencer ; Renfrew, Colin ; Schurr, Theodore G. ; Smith, Chris Tyler ; Platt, Daniel E. ; Pitchappan, Ramasamy Abstract Publication: PLoS ONE Pub Date: November 2012 DOI: 10.1371/journal.pone.0050269 Bibcode: 2012PLoSO...750269A