Hi Carole 'n Janet, Introducing .... The Electronic Zoo http://netvet.wustl.edu/e-zoo.htm Scroll down to Rodents... http://netvet.wustl.edu/rodents.htm Inbred Strains of Rats: ZI ZI Inbr. F26. Colour: Albino. Genet. c, zi. Origin: A breeder in W Germany to Hannover in 1980, to Kyoto in 1983. Carries rcessive autosomal gene "zitter" which causes spongiform encephalopathy of the central nervous system with tremors at 15 days of age as well as curley whiskers and hair (Yamada et al 1989). Yamada J., Mori M., Hamada S., Serikawa T., and Yamada J. (1989) Assignment of tremulous body mutant gene zitter (zi) to linkage group IV of the rat (Rattus norvegicus). J. Hered. 80, 383-386. http://www.informatics.jax.org/external/festing/rat/docs/ZI.shtml Now for your challenge Carole... What is a Sprague-Dawley rat? (used as a control in the PubMed article) :-) ............................... murray Ps: Didja know the Parkinson mice have their own mailing list? Chek it out.... (Big Blue Transgenic Mouse Mailing List Archives) http://www.bio.net/hypermail/bigblue/ [log in to unmask]