"genetic relationships among Caucasus populations reflect geographical rather than linguistic relationships", with Armenians and Azerbaijanians being "most closely related to their nearest geographical neighbours." Another 2004 study that looked into 910 MtDNAs from 23 populations in the Iranian plateau, the Indus Valley, and Central Asia suggested that populations "west of the Indus basin, including those from Iran, Anatolia and the Caucasus, exhibit a common mtDNA lineage composition, consisting mainly of western Eurasian lineages, with a very limited contribution from South Asia and eastern Eurasia." While genetic analysis of mtDNA indicates that Caucasian populations are genetically closer to Europeans than to Near Easterners, Y-chromosome results indicate closer affinity to Near Eastern groups.