DOUGLAS FARMER, SENIOR EDITOR [email protected]Researchers from Washington University in St. Louis have found a mechanism to efficiently and accurately measure the point spread functions (PSFs) of the position of molecules, called variance upper bound (VUB). They believe this will someday aid scientists and clinicians as they look to understand what is happening at the molecular level in the body. The researchers specifically used fluorescent molecules to bind with amyloid fibers and measure their differences in structure. 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