1. A VHH molecule of formula FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4, wherein said VHH molecule binds both a human and a non-human animal transferrin receptor (TfR) with an affinity (Kd) comprised between 0.1 nM and 10 μM, optionally conjugated to at least one molecule or scaffold, wherein the CDR1 sequence, the CDR2 sequence, and the CDR3 sequence comprise SEQ ID NOs: 1, 2 and 3, respectively; or SEQ ID NOs: 5, 6 and 7, respectively; or SEQ ID NOs: 9, 10 and 11, respectively; or SEQ ID NOs: 13, 14 and 15, respectively; SEQ ID NOs: 17, 2 and 3, respectively; or SEQ ID NOs: 19, 2 and 3, respectively; or SEQ ID NOs: 1, 21 and 3, respectively; or SEQ ID NOs: 1, 23 and 3, respectively; or SEQ ID NOs: 1, 2 and 25, respectively; or SEQ ID NOs: 1, 2 and 27, respectively; or SEQ ID NOs: 1, 2 and 29, respectively; or SEQ ID NOs: 1, 2 and 31, respectively; or SEQ ID NOs: 1, 2 and 33, respectively; or SEQ ID NOs: 67, 2 and 3, respectively; or SEQ ID NOs: 69, 2 and 3, respectively; or SEQ ID NOs: 1, 71 and 3, respectively; or SEQ ID NOs: 1, 73 and 3, respectively; or SEQ ID NOs: 1, 75 and 3, respectively; or SEQ ID NOs: 1, 2 and 77, respectively; or SEQ ID NOs: 1, 2 and 79, respectively; or SEQ ID NOs: 1, 2 and 81, respectively; or SEQ ID NOs: 1, 2 and 83, respectively; or SEQ ID NOs: 1, 2 and 85, respectively.
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