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wood prints asymmetric wood prints axon wood prints central nervous system wood prints cns wood prints dendrite wood prints neuron wood prints synapse wood prints nerve cell wood prints tem wood prints coloured wood prints false-coloured wood prints colored wood prints false color wood prints synaptic vesicle wood prints synaptic vesicles wood prints

photographs asymmetric photos axon photos central nervous system photos cns photos dendrite photos neuron photos synapse photos nerve cell photos tem photos coloured photos false-coloured photos colored photos false color photos synaptic vesicle photos synaptic vesicles photos

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Excitatory (asymmetric) synapses on a neuron dendrite (mammal central nervous system), coloured transmission electron micrograph (TEM). Two axon terminals (dark yellow) form excitatory synapses on a dendrite (green). Chemical synapses are specialized junctions through which nerve cells signal one another or other non-neuronal cells such as muscles. At a typical synapse an axon and a dendrite flank each other across a slender gap (synaptic cleft; purple and pink). Signalling molecules, known as neurotransmitters, are contained in tiny vesicles of the axon (light yellow). Neurotransmitters pass rapidly from axon to dendrite triggering an electrical impulse. Magnification: x16,245 when shortest axis printed at 25 millimetres.

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