Jose, check out the 4 papers by R. Thorne listed at http://www.px.nsls.bnl.gov/courses/papers/ZD_EG_papers.html
HTH, Kay -- Kay Diederichs http://strucbio.biologie.uni-konstanz.de email: [EMAIL PROTECTED] Tel +49 7531 88 4049 Fax 3183 Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz
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