In chemistry class, I learned about the reaction of pyruvate.

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He explained the importance of studying while young, saying 'If you do not study when you are young, it will be difficult to learn when you are old.'

He is suffering from acquired immune deficiency syndrome (AIDS).

She was diagnosed with polycystic ovary syndrome.

He was diagnosed with amyotrophic lateral sclerosis.

He contracted severe invasive streptococcal disease and underwent emergency surgery.