recent geneflow (~1500 years ago) shaped the genetic makeup of Southern Central Asian populations, such as the Tajiks. Culture Language The language of the Tajiks is an eastern dialect of Persian, called Dari (derived from Darbārī, "[of/from the] royal courts", in the sense of "courtly language"), or also Parsi-e Darbari. In Tajikistan, where Cyrillic script is used, it is called the Tajiki language. In Afghanistan, unlike in Tajikistan, Tajiks continue to use the Perso-Arabic script, as well as in Iran. However, when the Soviet Union introduced the Latin script in 1928, and later the Cyrillic script, the Persian dialect of Tajikistan came to be considered a separate (Persian) language. Since the 19th century, Tajiki has been strongly influenced by the Russian language and has incorporated many Russian language loan words. It has also adopted fewer Arabic loan words than Iranian Persian while retaining vocabulary that has fallen out of use in the latter language. In Tajikistan, in ordinary speech, also known as "zaboni kucha" (lit. "street language", as opposed to "zaboni adabi", lit. "literary language", which is used in schools, media etc.), many urban Tajiks prefer to use Russian loanwords instead of their literary Persian analogs. The dialects of modern Persian spoken throughout Greater Iran have a common origin. This is due to the fact that one of Greater Iran's historical cultural capitals, called Greater Khorasan, which included parts of modern Central Asia and much of Afghanistan and constitutes as the Tajik's ancestral homeland, played a key role in the development and propagation of Persian language and culture throughout much of Greater Iran after the Muslim conquest. Furthermore, early manuscripts of the historical Persian spoken in Mashhad during the development of Middle to New Persian show that their origins came from Sistan, in present-day Afghanistan. Religion Various scholars have recorded the Zoroastrian, Hindu, and Buddhist pre-Islamic heritage of the Tajik people. Early temples for fire worship have been found in Balkh and Bactria and excavations in present-day Tajikistan and Uzbekistan show remnants of Zoroastrian fire temples. Today, however, the great majority of Tajiks follow Sunni Islam, although small Twelver and Ismaili Shia minorities also exist in scattered pockets. Areas with large numbers of Shias include Herat, Badakhshan provinces in Afghanistan, the Gorno-Badakhshan Autonomous Province in Tajikistan, and Tashkurgan Tajik Autonomous County in China. Some of the famous Islamic scholars were from either modern or historical East-Iranian regions lying in Afghanistan,