article controlled study nonhuman 292 unclassified drug 138 priority journal 110 Animals 80 plant extract 68 plant leaf 68 animal cell 58 Argentina 52 antiviral activity 46 Plant Extracts 44 enzyme activity 40 mouse 40 Humans 38 animal experiment 38 Plant Proteins 36 human 36 plant root 34 Fungi 32 genetics 32 metabolism 32 protein expression 32 Plant Leaves 30 Plant Roots 30 human cell 30 in vitro study 30 Animalia 28 Gene Expression Regulation, Plant 28 Herpes simplex virus 1 28