Figure 2.
Surface renderings of individual elements bridging the synaptic cleft are color-coded according to size and shape in both an excitatory synapse (left) and an inhibitory synapse (right). Synaptic cleft elements at excitatory synapses fall into five categories: (A) S-shaped elements, asterisk indicates bulge (pink), (B) straight elements (yellow), (C) rook-shaped elements (blue), (D) sickle-shaped elements (purple), (E) doughnut-shaped elements, third indicates an element with three stalks (turquoise). Elements at inhibitory synapses fell into similar categories except the first category (A) has C-shaped elements and no elements fall into the fifth (E) category. Scale bar: 10 nm.