Yes, they used immunohistochemistry to tag cells, which generally requires removing the brain and imbuing it in a solution of chemicals and antibodies. Unfortun

Yes, they used immunohistochemistry to tag cells, which generally requires removing the brain and imbuing it in a solution of chemicals and antibodies. Unfortunately, non-invasive techniques (such as MRI for instance) still don't give you the cell-level precision that is the field standard for such studies.