Contact: Tom Abate
Stanford University Medical Center
Caption: In the excitatory opsin (left), the red depicts a channel of negatively charged amino acids that draws positive sodium ions into the neuron to turn it on. The new bioengineered inhibitory opsin (right) is more blue to denote its channel of positively charged amino acids that draws in negative chloride ions to turn the neuron off.
Credit: Deisseroth lab
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