Towards understanding the role of membrane cholesterol and sialic acid in the function of immune cells: studies with monoclonal antibodies PhD Thesis Andrea Balogh 2010 Supervisors: Prof. János Matkó D.Sc. Glória László Ph.D. Immunology Programme Programme leader: Prof. Anna Erdei D.Sc. Department of Immunology Institute of Biology Eötvös Loránd University, Budapest, Hungary