Electron micrographs of the inner molecular layer from control (A and B) and epileptic animals (C–E) demonstrating that terminals made symmetric synapses with dendritic shafts (arrowheads). Dense vesicles could be found in some presynaptic terminals (C, E), which contain a certain type of neuropeptide. Mossy fibers were also found in the inner molecular layer, and they were characterized by large in size, full of round vesicles, irregular shape (D, arrow). Scale bar in A is 200 nm.