animal tissue nonhuman 68 controlled study 60 priority journal 58 Animals 56 animal experiment 56 article 52 nitric oxide 50 enzyme activity 40 nitric oxide synthase 40 animal model 36 mouse 36 Nitric Oxide Synthase 34 female 34 protein expression 34 Female 32 Mice 30 male 30 rat 30 Male 24 animal cell 24 signal transduction 24 Rats 22 Nitric Oxide 18 Mice, Inbred BALB C 16 Signal Transduction 16 Disease Models, Animal 14 Mice, Inbred NOD 14 Nitric oxide synthase 14 Western blotting 14