... motif [20]; and finally the C-terminal domain is rich in arginin and glycin residues and is able to interact with ribo-somal proteins [21] or ligands like lactoferrin [13].Interestingly, the ... lipoproteins [4],matrix laminin-1 [5,6], attachment factor J [7,8] and endostatin [9], a domain of collagen XVIII, and itacts as a receptor of the anti-HIV cytokine midkine[10–12] and lactoferrin ... C-terminal domain of nucleolin, and that nucleolin participates, like midki-ne [10–12], in endocytosis and nuclear targeting of itsligand [13]. Since N-glycosylation interferes withthe structure...