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Design of the in vivo experiments: a) timeline of the in vivo hydrogel degradation (by MRI) and biocompatibility experiment; b) timeline of the [89Zr]Zr‐AuNPs hydrogel release and biodistribution study (by PET); and c) timeline of the study to demonstrate the radiosensitizing effect on xenograft tumors, of AuNP‐releasing hydrogels applied by a 3D‐printed subcutaneous implant.
