real time polymerase chain reaction nonhuman 108 controlled study 104 article 78 priority journal 70 metabolism 60 Animals 58 Article 56 Real-Time Polymerase Chain Reaction 56 human 56 genetics 54 Humans 46 protein expression 44 Western blotting 42 animal experiment 42 animal cell 40 animal tissue 40 female 40 messenger RNA 40 unclassified drug 40 gene expression 36 human cell 36 Female 34 mouse 34 male 32 Male 30 animal 30 reverse transcription polymerase chain reaction 30 signal transduction 30 Mice 28