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: [log in to unmask] Tel +49 7531 88 4049 Fax 3183
Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz
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