The company that makes medicine, called Ultragenyx Pharmaceutical, had their shares or pieces of the company go down in value by around 9%. This happened because some people who buy and sell stocks think the medicine they make might not work as well as before or there might be problems with it. When this happens, people want to sell their shares quickly, so the price goes down. Other companies also saw their shares change in value during the same time. Read from source...

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