animal model nonhuman 40 animal experiment 36 controlled study 34 priority journal 34 article 32 mouse 32 animal tissue 30 nitric oxide synthase 28 Animals 26 Mice 24 female 22 enzyme activity 20 Female 18 nitric oxide 18 protein expression 18 Mice, Inbred BALB C 16 Nitric Oxide Synthase 16 signal transduction 14 Mice, Inbred NOD 12 Sjoegren syndrome 12 animal cell 12 progesterone 12 submandibular gland 12 vasoactive intestinal polypeptide 12 NOD mice 10 Nitric oxide synthase 10 Vasoactive Intestinal Peptide 10 Western blotting 10 autoimmunity 10