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, Fondation des Treilles*. The authors gratefully acknowledge: Christine Neuveut (IP Paris) for helpful discussions and for sharing pFOP and pTOP plasmids

A. L. Epstein, Lyon) for sharing pA-EUA2 + lacZ plasmid

A. Sall, ) for their respective generous gifts of pJFH1, cell-culture adapted pJFH1-2EI3-adapt cDNA

S. Dabo and M. Fritz, IP Paris) for sharing experimental expertise; Sousana Kotanidou and Ksenia Rybkina for technical assistance

, IP Paris) for their help in the acquisition and processing of the immunofluorescence images; Sylvie van der Werf (Head of the Unit of Molecular Genetics of RNA Viruses) for her continuous support. *La Fondation des Treilles, créée par Anne Gruner Schlumberger, a notamment pour vocation d'ouvrir et de nourrir le dialogue entre les sciences et les arts afin de faire progresser la création et la recherche contemporaines. Elle accueille également des chercheurs et des écrivains dans le domaine des Treilles (Var), www.les-treilles.com. The Fondation des Treilles, created by Anne Gruner Schlumberger, is notably devoted to promote communications between sciences and arts to help contemporary creation and research move forward. The Fondation also houses scientists and writers