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. 2019 Dec 25;21(1):163. doi: 10.3390/ijms21010163

Figure 2.

Figure 2

The monoamine hypothesis of depression showing the potential factors that can cause a deficiency in the transmission within the monoamine systems (created with BioRender.com). The solid arrows indicate the flow of synaptic vesicles containing monoamine neurotransmitters. The dotted arrows indicate the release or reuptake of the monoamine neurotransmitters across the terminal of presynaptic neuron.