human 12 article 10 controlled study 10 complement activation 8 plant extract 8 plant leaf 8 Animals 6 Argentina 6 Complement Activation 6 Humans 6 Phagocytosis 6 Plant Extracts 6 complement inhibition 6 female 6 human cell 6 phagocytosis 6 Adjuvants, Immunologic 4 Article 4 Cedrela tubiflora 4 Complement 4 Complement Pathway, Alternative 4 Complement Pathway, Classical 4 Erythrocytes 4 Human 4 Leaf extracts 4 Neutrophils 4 Plant Leaves 4 Plants, Medicinal 4 Support, Non-U.S. Gov't 4 animal 4