Molecular characterization of feline infectious peritonitis virus strain 1 DF - 2 and studies on the role of ORF 3 abc in viral cell tropism 2 Running title : FIPV ORF 3 abc 3

Molecular characterization of feline infectious peritonitis virus strain 1 DF-2 and studies on the role of ORF3abc in viral cell tropism 2 Running title: FIPV ORF3abc 3 Ádám Bálint, Attila Farsang, Zoltán Zádori, Ákos Hornyák, László Dencső, 4 Fernando Almazán, Luis Enjuanes, and Sándor Belák 5 6 Department of Virology, Agricultural Office Veterinary Diagnostic Directorate, 7 Budapest, Hungary 8 Agricultural Office Directorate of Veterinary Medicinal Products, Budapest, Hungary 9 Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian 10 Academy of Sciences, Budapest, Hungary 11 Department of Molecular and Cell Biology, Centro Nacional de Biotecnología, (CNB12 CSIC), Campus Universidad Autónoma de Madrid, Madrid, Spain 13 The Joint R&D Division in Virology of SVA and SLU, the OIE Collaborating Centre for 14 the Biotechnology-based Diagnosis of Infectious Diseases in Veterinary Medicine, 15 Uppsala, Sweden 16 Corresponding author. Mailing address for Ádám Bálint: Department of Virology, 17 Agricultural Office Veterinary Diagnostic Directorate, H-1581, Tábornok u. 2, Budapest, 18 Hungary. 19 Phone: +36 1 460 63 74. Fax: +36 1 260 60 69. E-mail address: [email protected] 20 Word count for abstract: 243. 21 Word count for text: 5592. 22