Unconditioned anxiety and social behavior in two rat lines selectively bred for high and low anxiety-related behavior. - Henniger,M.S.H.; Ohl,F.; Hölter,S.M.; Weißenbacher,P.; Toschi,M.; Lörscher,P.; Wigger,A.; Spangel,R.; Landgraf,R. (Behav Brain Res, 2000)