TFRC and neoplasm: Second, ferritin has an inherent tumor‐targeting ability, which can specifically recognize and bind to tumor cells via transferrin receptor 1 (TfR1).[28] Third, ferritin can traverse the blood‐brain barrier (BBB), paving the way for brain tumor therapy.[29] Most importantly, abundant amino acid residues exist on the surface of ferritin that provide potential interactions (e.g., electrostatic interactions and hydrogen bonds) for supramolecular assembly with aminated fullerenes.