Article 6 human 5 nucleoside 5 unclassified drug 5 metabolism 4 nonhuman 4 Humans 3 Nucleosides 3 enzyme activity 3 mass spectrometry 3 Animals 2 Bacterial Proteins 2 Catalytic Domain 2 Mice 2 Nucleotides 2 RNA polymerase 2 SARS-CoV-2 2 Severe acute respiratory syndrome coronavirus 2 2 animal 2 antivirus agent 2 bacterial protein 2 chemistry 2 controlled study 2 disease association 2 enzyme active site 2 female 2 gene expression 2 liquid chromatography-mass spectrometry 2 male 2 mouse 2