Affiliation: | Mammalian Development B19, Department of Veterinary Clinical Sciences, The University of Sydney, N.S.W. 2006, Sydney (Australia), Fax +61 2 9351 4261, e-mail: daw@doolittle.vetsci.su.oz.au, AU Department of Cell Biology, Chest Disease Research Institute, Kyoto University, Sakyo-ku, Kyoto 606-01 (Japan), JP
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