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Greetings, Is there any RAG (1 or 2) deficient RAT strain available? Any suggestion will be most appreciated. Many thanks Ying-Feng D. Cheng University of Aberdeen ABERDEEN AB9 2ZD UK E-mail: opt018 at aberdeen.ac.uk Fax: (aberdeen) 685158 Tel: (Aberdeen) 681818 - 53782