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Legendary boxer Muhammad Ali died on Friday at 74, decades after he was diagnosed with Parkinson’s disease. He had recently been admitted to a hospital in Arizona with serious respiratory issues, and family members rushed to his bedside as his condition deteriorated.

The Associated Press offers some answers to common questions about Parkinson’s:

Read more from the AP.

For much more on Muhammad Ali, see TIME’s ALI: The Greatest, a 112-page, fully illustrated commemorative edition. Available at retailers and at AMAZON.COM

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