protein protein interaction 53 Article 45 human 44 Humans 35 genetics 31 controlled study 29 Biology, life sciences 26 nonhuman 24 Proteins 22 unclassified drug 22 metabolism 21 Research & information: general 20 gene expression 16 protein analysis 16 human cell 15 protein function 15 protein expression 14 female 12 Animals 11 Protein-protein interactions 11 Research and information: general 11 human tissue 11 pathology 11 Protein Interaction Maps 10 adult 10 animal 10 chemistry 10 male 10 protein binding 10 Western blotting 9