Red light, green light: flickering fluorophores reveal biochemistry in cells
Briefly

"PAPA, for the first time, lets us light up molecules that are interacting with a specific partner, and to look at those pairwise interactions within a cell."
"The earlier work 'was a very nice proof of concept, but here they moved it up a notch by adding single-molecule tracking so they could actually measure the diffusion of the protein complex as well as the individual protein.'"
Read at Nature
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