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"Kolkata, Feb 1: Using genetic data, Indian scientists have traced the emergence of a rigid caste system to about 1,600 years ago during the Gupta period when a lot of social transformation occurred. It, they claim, eventually left its mark on people's DNA. Researchers at the National Institute of.."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ap7am.com/english-news-21744-caste-system-left-its-mark-on-indians-dna-study.html>