Which of the diagrams in the figure represents a ligand-gated channel? 
Definitions:
Average Total Cost
The total cost of production divided by the total output, or the cost per unit of output on average.
Pharmaceutical Company
A commercial business that researches, develops, makes, and sells pharmaceutical drugs and treatments.
Average Revenue
The total revenue divided by the quantity sold, representing the amount of revenue generated per unit of output sold.
Marginal Revenue
The increase in revenue that results from the sale of one additional unit of a product or service.
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