fluorescence loss in photobleaching (FLIP), which involves repeated photobleach-
ing of a region of fluorescence within the cell [92]. Over time, this repeated
bleaching leads to permanent loss of fluorescent signal throughout the cell. This
indicates that free exchange of molecules occurs between the photobleached
region and the rest of the cellular compartments. Thus, nonbleaching of molecules
within the cell indicates where molecules are isolated and specifically localized in
distinct cellular compartments.
12.7.8 Total Internal Reflectance
Fluorescence Microscopy (TIRFM)
Total internal reflectance fluorescence microscopy (TIRFM) is used to monitor
the behavior of biomolecules directly at the single-molecule level, both in vitro
and in living cells. It ...