The present invention provides an adjuvanting material, the adjuvanting material comprising a lipid dendritic cell targeting moiety to which is covalently linked a metal chelating group. Further, the present invention provides an immunogenic composition comprising (a) a lipid dendritic cell targeting moiety to which is covalently linked a metal chelating group; (b) an antigen comprising a metal affinity tag; and optionally (c) metal ions, whereby the antigen is linked to the lipid dendritic cell targeting moiety via the interaction between the metal affinity tag and the metal chelating group.
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