Affiliation: | 1. Laboratory of Genetics, Dept. of Biology, University of Camerino, I-62032, Camerino (MC), Italy 2. Elektronenmikroskopisches Zentrallaboratorium der Universit?t Zürich, CH-8028, Switzerland 3. Max-Planck-Institut für Molekulare Genetik, W-1000, Berlin-Dahlem, Germany
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