A researcher is conducting an experiment to identify an unknown hormone. The experiment consists of exposing cells to the hormone and determining where the hormone is after a period of time. The researcher collects the data in the table below. What could be the identity of the unknown hormone? 
Definitions:
Midpoint Formula
A method used in economics to calculate the percentage change in quantity demanded or supplied, given two points, by dividing the change by the midpoint between the two points.
Price Elasticity
An economic concept indicating the responsiveness of the quantity demanded of a product to changes in its price, with high elasticity indicating greater sensitivity.
Foreign Travel
The activity of traveling outside one's home country for leisure, business, or other purposes.
Quantity Demanded
The amount of a good or service consumers are willing and able to purchase at a given price.
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