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Network of filaments linking SVs in the presynaptic terminal. A, The electron-dense materials surrounding the SVs (yellow) are superimposed on a virtual section. B, 3D reconstruction emphasizing that docked (blue) and other (gold) SVs are embedded in a tight meshwork of filaments (pink). C, Higher magnification of a partial reconstruction exemplifying the connections (pink) between neighboring SVs. Scale bar, 200 nm.
