Figure 1.

Summary of the metal-chelate-Rev complexes.^{31, 32} M = Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺. The sequence of the Rev peptide is shown above. The 7-coordinate geometries shown here for M-DOTA-Rev and M-DTPA-Rev are based on the X-ray crystal structures of [Fe-DOTA]¹⁻ and [Fe-DTPA]²⁻.^{33, 34}