nonhuman priority journal real time polymerase chain reaction 56 controlled study 54 Animals 50 article 50 animal experiment 38 animal tissue 36 mouse 36 Real-Time Polymerase Chain Reaction 34 animal cell 32 unclassified drug 32 Mice 30 messenger RNA 30 protein expression 26 Male 24 animal model 24 male 24 Female 22 female 22 human 22 Immunohistochemistry 20 Article 18 Humans 18 Western blotting 18 metabolism 18 Blotting, Western 16 RNA, Messenger 16 animal 16 gene expression 16