Singapore is a racially diverse society, so there's a natural pool of diversity from which one can draw for study of human variation. The Han majority of Singapore derive predominantly from Fujian in southeast China. The Indians are mostly from the southern regions dominated by Tamils or Telugus, but there are large minorities from all over the subcontinent. Finally, the Malay category is really an amalgam of peoples of Southeast Asian Muslim origin, from native Singaporean Malays, to Malaysian Malays, to immigrants from Indonesia. Singapore Genome Variation Project: A haplotype map of three South-East Asian populations: