 According to Underhill (2014), the downstream R1a-M417 subclade diversified into Z282 and Z93 circa 5,800 years ago.Even though R1a occurs as a Y-chromosome haplogroup among various languages such as Slavic and Indo-Iranian, the question of the origins of R1a1a is relevant to the ongoing debate concerning the urheimat of the Proto-Indo-European people, and may also be relevant to the origins of the Indus Valley Civilization.R1a shows a strong correlation with Indo-European languages of Southern and Western Asia and Central and Eastern Europe, being most prevalent in Eastern Europe, West Asia, and South Asia.