Interpolation maps for U6 haplogroup. (A) Map representing the centroids of sampling locations used for the spatial smoothing analyses of haplogroup frequencies (based on HV-I data sets). The resulting frequency maps are shown for U6 (B), U6a (C) and U6bd (D).
Pereira et al. BMC Evolutionary Biology 2010 10:390 doi:10.1186/1471-2148-10-390