Abstract
Isolated plasma membranes separate into two coexisting liquid phases with distinct lipid and protein compositions but live cell plasma membranes do not macroscopically phase separate, leading to questions of whether and how the membrane phase transition contributes to functional heterogeneity in cells. Using quantitative super resolution microscopy we show that B cell receptor signaling platforms are nanoscale domains that quantitatively enrich membrane probes based on probe phase partitioning in isolated plasma membrane vesicles.
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