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Electron micrograph of the fraction containing detergent-insoluble complexes. The band of detergent-insoluble complexes that floated to the region of 13–14% sucrose was collected and processed for transmission electron microscopic analysis as described in Materials and Methods. The isolated fraction comprises a heterogeneous population of vesicles ranging from 0.05 to 1.5 μm in diameter. Scale bar, 1 μm.
