Some of the upper and middle caste Muslim communities include Syed, Shaikh, Shaikhzada, Khanzada, Pathan, Mughal, and Malik.[300] Genetic data has also supported this stratification.[301] In three genetic studies representing the whole of South Asian Muslims, it was found that the Muslim population was overwhelmingly similar to the local non-Muslims associated with minor but still detectable levels of gene flow from outside, primarily from Iran and Central Asia, rather than directly from the Arabian Peninsula.[3]