In conclusion, hierarchical imprinting affords protein- discriminative phases for both soft and hard proteins of large sizes that present a high density of accessible binding sites. The loading capacity is high and, in the context of antibody purification, rivals the capture phases used in downstream processing.[2] Protein binding to the phases is reversible and the proteins can be specifically extracted from blood serum and then recovered in functional form upon a reasonably mild elution step. These features are encouraging for applications of protein-capturing MIPs in biotechnology and life sciences.