I'm not saying it's 'mystery' humans but it's 'mystery' humans who mated with us

[frogmarch]

9. Interesting!

Thanks for your post.

Here’s a link to longer article about it. The title ("Mystery Human Ancestor Found in African Genes&quot is somewhat misleading, but I think the article itself is quite good.

http://chronicle.com/blogs/percolator/mystery-human-ancestor-found-in-african-genes/30223

Another key finding is that most of the new variants are not genes —stretches of DNA that code for proteins that run a cell’s machinery—but regulatory regions that sit next to genes, turning them on or off, or increasing their protein production rate the way a radio volume knob increases sound. “Just because a stretch of DNA doesn’t have any genes doesn’t mean it can’t be functionally important,” noted Joseph Lachance, a postdoctoral researcher at Pennsylvania who is first author on the paper. To the contrary, he said, because those regions persisted and most genes didn’t, it shows that things like on-off switches are important evolutionary adaptations.