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Hi Geoff,
None of the three articles cited can definitively rule out the possibility
that the genetic remnants of some interbreeding of modern humans with
Neanderthals and/or Denisovans. After reading these and a couple of other
articles on this topic, it appears that the primary distinction between the
Out of Africa hypothesis and the Multi-Regional hypothesis is where this
interbreeding took place. The former seems to hold that it took place in
Africa and the latter seems to assert that the interbreeding took place
outside of Africa. Both hypotheses seem to acknowledge that there was some
intermixing of the genes of these different lines.  Please notice that #2
below states that there was only "limited interbreeding: one with
Neanderthals and one with Denisovans" in the Out  of Africa hypotheis. 

1. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2629215/
2. http://en.wikipedia.org/wiki/Multiregional_origin_of_modern_humans


>http://en.wikipedia.org/wiki/Neanderthal_extinction_hypotheses#Interbre
>edin
g
>http://en.wikipedia.org/wiki/Denisova_hominin#Interbreeding_with_modern
>_hum
ans
>http://www.ts-si.org/biology/30943-modern-humans-interbred-with-archaic
>-hom
inids-before-leaving-africa
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We may never have the answer. All we have is clues from fossils. Maybe one
day we will find some good remains where some DNA can be extracted.  
All humans from  every corner of the world can successfully mate and have
children. Whatever genes we acquired did not make us different enough to
prevent breeding.







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