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This article focuses on organic nanoparticles, whose size and rigidity are finely tuned by cross-linking the end groups of dendrimers. The chemical or physical cross-linking of polymers is a well- studied process of incalculable practical importance. Recent interest has focused on cross-linking fewer polymer molecules within self-assembled structures or organized materials. The degree of rigidity imposed on these dendrimers in the cross-linking process creates a molecular memory of the core, and thus, a type of synthetic antibody can be made by covalent imprinting.