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Tubular compartments in dendrites and spines.a, SER (arrowhead) extends into the neck of a thin spine. A non-SER tubular compartment (arrow) at the origin of the spine exhibits a uniform diameter compared with SER. b, A non-SER tubule (arrow) in a spine neck. c, A coated bud (∗) at the tip of a tubule. Note the darker interior of the tubular compartments (arrows) as compared with SER (arrowheads). Scale bar, 0.5 μm.
