nonhuman 78 priority journal 70 controlled study 69 article 68 nitric oxide synthase 66 Animals 57 animal experiment 52 animal tissue 51 nitric oxide 51 enzyme activity 45 Nitric Oxide Synthase 39 animal model 37 mouse 36 protein expression 36 female 33 Female 32 male 31 Mice 28 Nitric Oxide 28 animal cell 27 signal transduction 27 rat 26 Male 25 Nitric oxide synthase 22 Nitric oxide 20 unclassified drug 19 enzyme activation 18 inducible nitric oxide synthase 18 Humans 16 Signal Transduction 16