Ötzi's oldest blood

Do you think blood could last 5,300 years on a body? When you're Ötzi the Iceman, it can.
The preserved body of "Ötzi" was found frozen in ice up in the Italian Alps. You might have heard that analysis of the body could determine his sex, his last meal, even the fact he was lactose intolerant. http://www.nature.com/ncomms/journal/v3/n2/full/ncomms1701.html

But now, at the University of Darmstadt, Germany, in the Center for Smart Interfaces a professor and his team are using atomic force microscopy on little slices of skin from an area on Ötzi surrounding the arrow wound which killed him.

How does it work? The BBC summarises it well:
"The technique works using a tiny metal tip with a point just a few atoms across, dragged along the surface of a sample. The tip's movement is tracked, and results in a 3-D map at extraordinary resolution."
http://www.bbc.co.uk/news/science-environment-17909396

They can now reopen the question as to whether Ötzi dies immediately from his wound or days afterwards.

Incredible.

Oh, and apparently, Brad Pitt has a tattoo of Ötzi's outline on his forearm. I wonder if it will survive as long as Ötzi did. I just hope he's not going to get his blood next, because goodness knows what he'll do with that.