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metal prints asymmetric metal prints mammal metal prints excitatory synapse metal prints microtubule metal prints microtubules metal prints synaptic junction metal prints mitochondria metal prints mitochondrion metal prints brain metal prints neurons metal prints tem metal prints neurone metal prints

photographs asymmetric photos mammal photos excitatory synapse photos microtubule photos microtubules photos synaptic junction photos mitochondria photos mitochondrion photos brain photos neurons photos tem photos neurone photos

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Excitatory (asymmetric) synapses on a neuron dendrite (mammal central nervous system), transmission electron micrograph (TEM). Two axon terminals form excitatory synapses on a dendrite. 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; red). Signalling molecules, known as neurotransmitters, are contained in tiny vesicles of the axon. 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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