Morphological evidence of a connection between the core of granulated vesicles and their membrane.
D000818:Animals; D002454:Cell Differentiation; D008854:Microscopy, Electron; D010870:Pineal Gland / Q000166:cytology* / Q000196:embryology; D051381:Rats; D013570:Synaptic Membranes; D013572:Synaptic Vesicles