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Biological
- ... for mitral valve replacement—mechanical valves (metal) or biological valves (tissue). The principal advantage of mechanical valves ... small risk of stroke due to blood clotting. Biological valves usually are made from animal tissue. Biological ...
- ... aortic valve replacement (AVR) – mechanical valves (metal) or biological valves (tissue). The principal advantage of mechanical valves ... have to have their blood levels checked regularly. Biological valves are most commonly made from animal tissue. ...
- ... the development and availability of therapeutic drugs and biological products to prevent or treat COVID-19. The ...