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Diagnostic magnetic resonance profiling of human tumor cell lines, fibroblasts, and leukocytes using a pretargeted approach in vitro. The cells were labeled using various trans-cyclooctene (TCO)-conjugated antibodies followed by tetrazine-modified magneto-fluorescent nanoparticles (Tz-MFNPs) prior to the measurement of the transverse relaxation rate (R2). Figure reprinted with permission from Haun et al. [95].
