Indigenous Arabs Direct Descendents of Modern Human Wave From Africa?

PhysOrg is running a story about research coming out of Weill Cornell Medicine and Qatar.  Abigail Fagan writes:

The investigation, published online Jan. 4 in Genome Research, sequenced the genomes of 104 Arabian Peninsula natives and compared them with 1,092 genomes from worldwide populations. The researchers compared each pair of genomes in the sample, which allowed them to cluster research participants by genome similarity so that an evolutionary tree emerged. The genomes of indigenous Arabs resulted in a unique cluster separate from the initial African population, illustrating the formation of a distinct population. European and Asian clusters diverged after the Arab population.

These data reinforce the "southern route" model of early modern human origins, which argues that early modern humans left Africa initially by crossing over or ferrying over the northern tip of the Gulf of Aden, near what is currently Djibouti.