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. Correspondence, E-mail address : lotteau@cervi-lyon.inserm.fr 3 Abbreviations used in this paper: APC, Antigen presenting cells; DC, Dendritic cells; FCS, Fetal calf serum; GM-CSF, Granulocyte macrophage-stimulating factor; HDL, High density lipoprotein; LDL, Low density lipoprotein; LPDS, Lipoprotein deficient serum