I'm very curious about, in descending order, a) whether this protein can be synthesized, b) whether it can be efficiently extracted from nonhuman creatures, and c) whether removing it from a creature ages it, or if it can be replaced with no real loss.
a) whether this protein can be synthesized
In what way does is that a question? A protein is just a gene that get's transcribed by a ribosome. You can put that gene into least and let the yeast build the protein. The protein might kill the yeast and it might take a while to get the process streamlined but in principle every protein can by produced by yeast or some bacteria.
b) whether it can be efficiently extracted from nonhuman creatures
Who cares? It's not like we extract insulin from animals these days and we probably want the human version of the...
In experiments performed on mice, blood transfusions from young mice reversed age-related markers in older mice. The protein involved is identical in humans.
http://mic.com/articles/88851/harvard-scientists-may-have-just-unlocked-the-secret-to-staying-young-forever