plant leaf 116 Biology, life sciences 99 nonhuman 94 controlled study 89 Research & information: general 80 plant extract 80 unclassified drug 77 Article 70 Plant Leaves 52 chemistry 51 male 47 animal experiment 45 antioxidant 44 Plant Extracts 41 Plants (botany) 40 article 39 animal model 37 rat 37 Animals 35 antioxidant activity 34 human 34 Antioxidants 31 animal 30 methanol 30 Forestry 29 Research and information: general 29 metabolism 29 animal tissue 27 Male 26 flavonoid 25