1. Department of Plant Physiology and Molecular Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, Bulgaria
2. Department of Animal Genetics, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
3. National Centre of Infectious and Parasitic Diseases, Sofia, Bulgaria
4. Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, UK