Sjoegren syndrome article 28 priority journal 28 controlled study 26 female 26 mouse 26 nonhuman 26 Animals 24 Mice 24 Mice, Inbred BALB C 24 Mice, Inbred NOD 24 Vasoactive Intestinal Peptide 24 animal experiment 24 animal model 24 Female 22 vasoactive intestinal polypeptide 22 Sjogren's Syndrome 20 animal tissue 18 enzyme activity 16 submandibular gland 16 protein expression 14 Apoptosis 12 Disease Models, Animal 12 NOD mice 12 Submandibular Gland 12 animal cell 12 apoptosis 12 nitric oxide 12 nitric oxide synthase 12 signal transduction 12