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* Epigenome folding in Drosophila (Collaboration: G. Cavalli, IGH, Montpellier, France) * Dosage compensation in C. elegans (Collaboration: P. Meister, ICB, Univ. of Bern, CH) * Chromatin dynamics during spermatogenesis (Collab.: S. Khochbin, Institu A. Bonniot, Grenoble)