"They first appear in the entorhinal cortex, a small area of the brain behind the ears that controls memory and navigation.......Do we tap the entorhinal cortex the small area of the brain behind the ears to look for these dying tau filled cells?"
Sure. It would go something like "Honey, I can't remember where I put the car keys." And she says "Let's go get you a simple brain surgery and see if you're developing Alzheimers. It should only cost, oh, maybe a hundred grand or so."
The article was not about some new "technology," rather it was about a new discovery of a biological process that might suggest a target or targets for early intervention.
Certain people around here asked what was the point of Opko developing an early detection test if there was no cure for AD. It wasn't a brilliant question to begin with, but now that the mechanism of the disease is better understood, stopping it sooner would be better.
And since they are working on MICE, and OPK is working on humans, it is not competition.