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The final analysis from its Phase III clinical trials showed a 94.1% efficacy in preventing COVID-19 illness and a 100% efficacy in preventing severe COVID-19

In addition, cellular cysteine is also available through the transsulfuration (TSS) pathway from the sulfur-containing amino acid methionine

Neutrophil elastase inhibitors: a potential prophylactic treatment option for SARS-CoV-2-induced respiratory complications
(2020) 158:19992014.e1
Isolation of a novel coronavirus from a man with pneumonia in Saudi Arabia

Melatonin modulates plant tolerance to heavy metal stress: morphological responses to molecular mechanisms
