It's called presenilin 1, the scientists announced in the June 8 issue of the journal Nature.

FORBES: On The Trail Of Alzheimer's

But presenilin 1 is a promising drug target if it is really the mysterious gamma secretase.

FORBES: On The Trail Of Alzheimer's

Indeed, a group of Harvard scientists will also publish a paper identifying presenilin 1 as gamma secretase in the July issue of Nature Cell Biology.

FORBES: On The Trail Of Alzheimer's