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Nozomi Ytow Institute of Biological Sciences/Gene Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan e-mail address: nozomi@biol.tsukuba.ac.jp |
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David R. Morse Computing Dept, Faculty of Mathematics and Computing, The Open University, Walton Hall, Milton Keynes MK7 6AA, Great Britain e-mail address: D.R.Morse@open.ac.uk |
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David McL. Roberts Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, Great Britain e-mail address: dmr@nhm.ac.uk |