[Rambo]

from that article:

Haplogroup 21 was frequent in the Greeks but in these Pakistani populations was found only in the Pathans. Based upon haplogroup frequencies, 65-88% Greek admixture was estimated for the Kalash, consistent with a Greek origin for a significant proportion of Kalash Y chomosomes. However, the Kalash lack haplogroup 21 chromosomes and appeared distinct from the Greeks based upon principal components analysis of haplogroup frequencies and weighted population pairwise FST values based on STR variation within Y Haplogroups. They clearly contain a substantial proportion of Pakistani Y chromosomes, illustrated by their high frequency of hg 28, and the true Greek contribution remains uncertain. Estimates of Greek Y admixture for the Pathans were about 10%, and for the Burusho were close to zero. Median-joining networks of STR haplotypes revealed considerable sub-structuring of Y variation within the Kalash and Burusho, and in particular the haplogroup 21 network showed that the Pathan chromosomes were closely related to the central Greek cluster. Thus a small Greek contribution to the Pathans seems likely, the contribution to the Kalash is unclear and no contribution to the Burusho could be detected.