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What exactly is your position? That Somalis are relatively unmixed? Because all that source says, is that the non-African component in Somalis is not related to modern day Yemenis. Nobody on this thread even said that our admixture derives from Peninsula Arabs.Some people need to read their sources very closely. Samples are not representative and guess what? It's all hypothesis, do you even know how they got those results?
Just read:
"To investigate this further, we generated new genome-wide SNP data for a Yemeni population sample and merged these new data with published genome-wide genetic data from the HOA and a broad selection of surrounding populations. We used multidimensional scaling and ADMIXTURE methods in an exploratory data analysis to develop hypotheses on admixture and population structure in HOA populations. These analyses suggested that there might be distinct, differentiated African and non-African ancestries in the HOA."
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1004393
A recent Yemeni population sample was used in comparison, the study itself says its hypothesis and the results are only suggestive at best.
The whole thing was speculative from the beginning due to derivation of these results.