Avatar-related book: What do you think of this prologue?

[Human No More]

That's interesting - seemed a bit weird at the start though - I got the impression that it was an intentional attempt to confuse the reader. If not, then you might want to work on that part

I can't really offer advice on the writing itself, but I like it. One thing though, is "the spindly one eats the original cell" - doesn't really work in terms of cell interaction as a process - engulfs might be better.
Also, small crypto nitpick: "addressed to your public key" - a message is encrypted with one, then it can only be decrypted with the paired private key - it isn't something most people would really notice, but if you say it's "encrypted with your public key" instead, that makes more sense - biology and computers are the two things I really know well, I'd be happy to point out any more such things on those.

Last paragraph == WIN