human protein protein interaction Humans 158 priority journal 124 controlled study 120 nonhuman 104 human cell 102 Animals 92 unclassified drug 90 article 88 metabolism 80 protein expression 78 protein function 70 signal transduction 68 Article 58 animal 54 genetics 46 mouse 44 Cell Line 40 Mice 38 animal cell 38 cell proliferation 38 chemistry 36 protein domain 36 Protein Binding 34 Signal Transduction 34 protein binding 32 Cell Line, Tumor 28 Transcription Factors 26 gene expression regulation 26