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Among the very legit businesses you'll also find essay writing services, insurance companies, and blog spam. Like I understand that open source needs funding, but is **this** really the way?
https://twitter.com/Grammarly/status/1067213161932017664
People with AAT produce antitrypsin that is a different "shape" and it gets stuck in the liver and never reaches the lungs. This can lead to liver disease. The lack of antitrypsin in the lungs also makes you a lot more prone to developing lung related diseases like emphysema.