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Molecular structure of gadolinium methanethiosulfonate (Gd[MTS-ADO3A]) and variants of apolipoprotein AI (apo AI). The structure of Gd[MTS-ADO3A] is shown on the left with the thioester linker. On the right is the ribbon diagram of the protein apo AI with cysteine (Cys) replacing serine at position 55 or glutamine at position 76.
